EMBL Nucleotide Sequence Database: Release Notes

      Release 61, December 1999

         EMBL - European Bioinformatics Institute                    Telephone: +44-1223-494444  Telefax: +44-1223-494468
         Wellcome Trust Genome Campus, Hinxton                    Electronic mail: DataLib@EBI.AC.UK
         Cambridge CB10 1SD,  United Kingdom                        URL: http://www.ebi.ac.uk

CONTENTS 1 RELEASE 61

The EMBL Nucleotide Sequence Database was frozen to make Release 61 on 03-DEC-1999. The release contains 5,303,436 sequence entries comprising 4,508,169,737 nucleotides. This represents an increase of about 27% over Release 60. A breakdown of Release 61 by division is shown below:
 

Division 

Entries 

Nucleotides 

Bacteriophage
1,493 
3,772,075 
EST
    3,352,471 
        1,280,533,161 
Fungi            35,387              65,382,544
GSSs       1,135,096            584,522,641 
HTG            11,236          1,137,902,159
Human           101,754            611,811,099 
Invertebrates             43,125            178,290,696 
Organelles            53,615              45,527,348 
Other Mammals            22,071              20,697,174 
Other Vertebrates            20,197              23,184,728 
Patents          188,650               59,188,603 
Plants             44,530             143,428,159 
Prokaryotes            68,545             164,563,553 
Rodents            49,195               74,393,858
STSs            90,061              32,796,622 
Synthetic              3,355                 7,987,485 
Unclassified              1,454                2,274,354 
Viruses            81,201               71,913,478 
total       5,303,436         4,508,169,737

1.1 Splitting EMBL cumulative update file

Several sites have reported problems handling our EMBL cumulative update file when it grows beyond 2GB (uncompressed). The problems are either at  the operating system level where the filesystem doesnot support >2GB files,
or SRS5 which does not handle files >2GB (while SRS6 does).

In *addition* to the cumulative.dat.gz  files we make available on our FTP server, we now also split that dataset into smaller parts, namely:

cum_1.dat.gz    all the cumulative files except the data in files below
cum_est1.dat.gz ESTs
cum_htg1.dat.gz HTG
cum_hum1.dat.gz human (non-gss,non-HTG, non-EST)
cum_gss1.dat.gz GSS

We chose this data division:
- because it represents the current major division of data in the updates
- to try to keep the files below 2GB for as long as possible, eg before needing cum_hum2 etc - to avoid frequent
  changes. Due to the Draft Human Genome effort we expect the HTG division to be a likely candidate for further
 splitting in the near future.

These filenames should last a while and contain some data even soon after a new full release. SRS icarus  files (for example) should not need constant changing, and when they do we should be able to see it coming well beforehand.

Those who 'mirror' our ftp.ebi.ac.uk/pub/databases/embl/new directory may wish to have either the full cumulative.dat.gz or the cum_* set ignored, in order to save some netwidth. The data contained is the same - we build the cum_* files from the cumulative.dat.gz file afresh each day. There is no correspondence between, cum_est1.dat and the est1.dat file of the full release.
The EBI SRS server now has the EMBLNEW dataset using these cum_* files.
 

1.2 Cross-reference Information

Interconnectivity between the nucleic acid database and other related databases is becoming an essential prerequisite for utilising the wealth of information becoming available. Links to a growing list of external databases will be expanded allowing integration with specialised data collections. These will include protein databases, species-specific databases, taxonomy databases as well as other specialised data collections. The WWW-based sequence retrieval system (SRS) will enable users to easily navigate between cross-referenced database entries.
 
EMBL links to other databases:

 DATABASE       Number of links

 RZPD                   684241
 TrEMBL                 256736
 AGIS                   160085
 Swiss-Prot             134427
 MaizeDB                 43859
 IMGT/LIGM               28305
 MENDEL                  21033
 FLYBASE                 10763
 GDB                      8430
 MGD                      8079
 TRANSFAC                 6620
 SGD                      6029
 IMGT/HLA                 2168
 EPD                      1198
--------               -------
 Total                 1371973

Example:
DR   RZPD; IMAGp998G19998; 16-Jul-1999.
1.3 Database Files

In order to keep the size of the data files within reasonable limits for handling purposes, additional division files will be added in subsequent releases as appropriate.

1.4 EST Database Files

The EST division has been split into into 34 files.  (est1.dat-est34.dat).

1.5 GSS Database Files

The GSS division has been split into 12 files (gss1.dat-gss12.dat).

1.6 HUM Database Files

The HUM division has been split into 5 files. (hum1.dat-hum5.dat).

1.7 HTG Database Files

The HTG division has been split into 3 files. (htg1.dat-htg3.dat).

1.8 Draft Human Genome

A consortium of 5 major sequencing centres (Sanger, Baylor,WashU, Whitehead, DOE) are involved in establishing the draft human genome. The Sanger Centre (UK) is the European participant producing about 33% (~1 Gb) of the high-through-put draft genome sequence data (HTG phase 1) including high-throughput automatic annotation. The project is expected to be completed by February 2000. As a direct result the Release 61 High-Throughput-Data division (HTG) now includes over 1,137 Mbases (11,236 entries), compared to 544 Mbases (4,781 entries) in Release 60 (Sep 1999).
 

2 FORTHCOMING CHANGES


2.1 Replacement of organelle-related qualifiers with new qualifier /organelle

A large variety of organelle qualifiers currently exist: /mitochondrion, /chromoplast, /chloroplast, etc. Starting with EMBL  Release 62 (March 2000), these qualifiers will all be incorporated into a single new qualifier, with a controlled value format. The preliminary description of this qualifier is as follows:

Qualifier       /organelle=""

Definition      type of membrane-bound intracellular structure from
                which the sequence was obtained

Value format    mitochondrion, nucleomorph, plastid, mitochondrion:kinetoplast,
                plastid:chloroplast, plastid:apicoplast, plastid:chromoplast,
                plastid:cyanelle, plastid:leucoplast, plastid:proplastid,

Examples        /organelle="mitochondrion"
                /organelle="nucleomorph"
                /organelle="plastid"
                /organelle="mitochondrion:kinetoplast"
                /organelle="plastid:chloroplast"
                /organelle="plastid:apicoplast"
                /organelle="plastid:chromoplast"
                /organelle="plastid:cyanelle"
                /organelle="plastid:leucoplast"
                /organelle="plastid:proplastid"

Comments        modifier text limited to values from controlled list


2.2 Mutation and Allele features to be discontinued

At the May 1999 collaborative DDBJ/EMBL/GenBank meeting the usage of change feature keys 'variation', 'mutation', and 'allele' was reconsidered.
It was decided to redefine  anduse 'variation' to describe alleles, RFLP's, and other naturally occuring mutations and polymorphisms. Variability arising as a result of genetic manipulation (e.g. site directed mutagenesis) will be described with the misc_difference feature.

Based on this collaborative decision, the EMBL database will at Release 62 (March 2000) convert feature keys mutation and allele to variation, while feature keys 'mutation' and 'allele' will be discontinued.

For further details on feature keys and qualifiers please see the new version of the Feature Table Definition Document (v2.2)  available from the EBI servers after Dec 21st, 1999.
(http://www.ebi.ac.uk/emblDocumentation/FT_definitions/feature_table.html)

2.3 Value format of /number to be modified
 

At the May 1999 collaborative DDBJ/EMBL/GenBank meeting it was decided to
modify /number to allow better representation of alternative exon designations
(e.g. 6B). 

Qualifier       /number=
Definition      a number to indicate the order of genetic elements (e.g.,
                exons or introns) in the 5' to 3' direction
Value format    unquoted text
Example         /number=4
                /number=6B
Comment         text limited to integers, letters or combination of integers
                and/or letters represented as an unquoted single token
                (e.g. 5a, XIIb). Any additional terms should be included in
                /standard_name.
                Example:  /number=2A
                          /standard_name="long"
This will be implemented with Release 62 (March 2000)


2.4 /evidence made legal on all feature keys

Starting from Release 62 (March 2000) /evidence will be legal on all feature

2.5 Genome Representation

An experimental directory representing genome data has been available from the EBI anonymous FTP server in directory

/pub/databases/embl/genomes

including a number of files for each genome: a file listing construct information and all accession numbers relevant to the project, the complete single entry in EMBL format (DNA and features), the complete DNA sequence in FASTA format, e.g.

 in ftp://ftp.ebi.ac.uk/pub/databases/embl/genomes/Eubacteria/bsubtilis/

README
bsubt.con
bsubt.embl
bsubt.embl.Z
bsubt.fasta
bsubt.fasta.Z

Efforts are now undertaken to develop a new database division (CON) to represent these complete genomes, or other long sequences constructed from segment entries. The CON division will contain construct information, accession numbers and sequence locations involved in building the constructs.
 

Additionally, the according complete entries including descriptive information , references, features, DNA sequence will be linked, searchable and retrievable through SRS and available for BLAST and FASTA homology searching.
3 SEQUENCE SUBMISSION SYSTEMS

3.1 Checking Sequence Data For Vector Contamination

We urge submitters to remove vector contamination from sequence data before submitting to the database. To assist submitters the EBI is providing a Vector Screening Service using the latest implementation of the BLAST algorithm and a special sequence databank known as EMVEC. EMVEC is an extraction of sequences from the SYNthetic division of EMBL containing more than 2000 sequences commonly used in cloning and sequencing experiments. EMVEC is by no means a complete vector databank but EBI believes it is representative of the kind of material used in modern sequencing and should be useful to submitters. The databank will be updated with each release of EMBL and made publicly available on the EBI's ftp (ftp.ebi.ac.uk) server for those who wish to have it.

The interactive WWW service can be found at:

http://www.ebi.ac.uk/emblSubmission/webin.html
http://www.ebi.ac.uk/blastall/vectors.html

The results will list sequences producing significant alignments and associated information like vector name, score, alignment etc

3.2 WebIn - WWW Sequence Submission System

WebIn is the preferred WWW Sequence Submission System for submitting nucleotide sequence data and associated biological information to the EMBL Nucleotide Sequence Database at the European Bioinformatics Institute (EBI).  To access WebIn at the EBI please use the following URL:

http://www.ebi.ac.uk/emblSubmission/webin.html

Database entries created by the new WWW submission tool and submitted to the EMBL Nucleotide Sequence Database at the EBI will be exchanged and shared among the International Collaboration of Nucleotide Sequence Databases (DDBJ/EMBL/GenBank).

WebIn guides the user through a sequence of WWW forms allowing the submission of sequence data and descriptive information in an interactive and easy way. All the information required to create a database entry will be collected during this process:

1 Submitter Information
2 Release Date Information
3 Sequence Data, Description and Source Information
4 Reference Citation Information
5 Feature Information (e.g. coding regions, regulatory signals etc.)

EBI staff will process data submissions within 2 working days and send the database accession number(s) assigned to your data to your e-mail address.

3.3 Bulk Submissions

With the aim to make bulk sequence submission highly efficient and less time consuming for the submitters, a prototype of a new web-based bulk sequence submission system can now be accessed from WEBIN. Authors planning to submit a large number of similar sequences (i.e.,>25) are presented with an option for "Bulk WebiN Submission". When choosing the bulk path, submitters carry on the usual WEBIN submission procedure until having finished a first and single representative sequence. During the submission process database staff will interactively assist in making the submission of this specific data as convenient as possible, thus saving the author the time and effort required to complete numerous submission events individually.

Alternatively, authors planning to submit very large numbers of similar sequences should contact the database before submitting the data. Database staff will then assist in making the submission of this data as convenient as possible, thus saving the author the time and effort required to complete numerous submission events individually. When contacting database staff, authors should indicate the number of sequences they plan to submit. Database staff will create series of templates and communicate these to the author for completion with just the information unique to each sequence required. These templates, once resubmitted, will then be processed en masse by
database curators.

Please contact database staff if you require further information.

e-mail: datasubs@ebi.ac.uk

Tel:   +44-1223-494499
Fax:  +44-1223-494472
 

3.4 SEQUIN - Stand-alone Submission Program

Sequin is the multi-platform (Mac/PC/Unix) stand-alone software tool developed by the NCBI for submitting entries to the EMBL, GenBank, or DDBJ sequence  databases. The Sequin program, along with detailed downloading and installation instructions plus general information are available from the EBI via WWW browser and anonymous FTP.

http://www.ebi.ac.uk/Sequin/
ftp://ftp.ebi.ac.uk/pub/software/sequin/

3.5 Sequence Alignment Submissions

The EBI accepts submissions of alignment data (e.g. from phylogenetic and population analysis etc..) of both nucleotide or amino-acid sequences. This data is assigned an alignment number (e.g. ds38200) by database staff which is then communicated to the submitter. We suggest that this number is quoted in the resulting publication.

Alignment data and associated information are made available via EBI's network servers (see below).

ALIGNMENT FORMATS:

As well as your alignment data we require information describing your alignment (see table below) Please provide information for all fields.
Description Field Information required
TITLE: Title of alignment
SUBMITTER: Name, Affiliation, Phone, Fax, Email
RELEASE DATE: Public Immediately / if Confidential please provide hold date
CITATION: If known please provide complete Author list, Title, Journal, Year of publication, Page numbers
ALIGNMENT METHOD: Method of alignment and format submitted, parameters of alignment sequences used (if appropriate)
DESCRIPTION OF SYMBOLS: e.g. Gaps indicated by a dash '-'
DESCRIPTION OF ALIGNMENT: Describe sequences aligned, including accession numbers (if known) and abbreviation of clones or taxon used in alignment file. If your alignment contains sequences derived from multiple taxoonomic sources, please provide the full name of each organism
FILE FORMAT: We are currently updating and improving both the access to and alignment output of this archive due to an increase in the submission of alignment data. The compilation of text files and the issue of format standardisation are undergoing review and are being discussed by the database staff, external users and experts in the field. 

We suggest submission in STANDARD ALIGNMENT FORMATS eg. (NEXUS, PHYLIP, ClustalW etc) or Sequin output.

A sample alignment in NEXUS format can be viewed at ftp://ftp.ebi.ac.uk/pub/databases/embl/align/ds32096.dat

NOTE 1: Alignments can be created within Sequin or imported into Sequin from files in a standard alignment format like NEXUS or PHYLIP.

NOTE 2: If reporting new primary sequence data, we suggest that you submit the complete individual sequence files (e.g. via Sequin or Webin), in order to include the sequence data as individual entries in the database. If gaps have been introduced for the alignment, please leave them out when sending the individual sequence files.

SENDING ALIGNMENT DATA to the EMBL Nucleotide Sequence Database
Sequence Alignment Data can be sent to the Nucleotide Sequence Database by Electronic mail to DATASUBS@EBI.AC.UK

ACCESSING ALIGNMENT DATA
Alignment data and additional information are available via the EBI servers:

 

EBI WWW server:   http://www.ebi.ac.uk/emblSubmission/alignment.html
                  ftp://ftp.ebi.ac.uk/pub/databases/embl/align/

EBI FTP server:  by anonymous FTP from FTP.EBI.AC.UK in directory /pub/databases/embl/align


EBI File server: by sending an e-mail message to netserv@ebi.ac.uk  

                 including the line HELP ALIGN or GET ALIGN:DS8200.DAT

3.6 Further Submission Information

3.6.1 Annotation Guides

To help and guide submitters in annotating their sequences, two new online guides are now available via hyperlinks  from within WEBIN: EMBL Annotation Examples  and EMBL Features and Qualifiers. The annotation examples consist of a list of EMBL approved feature table annotations for common biological sequences. The EMBL Features and Qualifiers is a complete list of feature table key and qualifier definitions providing detailed descriptions, mandatory and optional qualifiers and usage examples.

For further information on submission of sequence data to the EMBL Nucleotide Sequence Database please access:

http://www.ebi.ac.uk/emblSubmission/

or contact database staff at:

EMBL Nucleotide Sequence Submissions
e-mail: datasubs@EBI.AC.UK
telephone: +44-1223-494499
telefax: +44-1223-494472

4 CITING THE EMBL NUCLEOTIDE SEQUENCE DATABASE

We encourage authors to include a reference to the EMBL Database in publications related to their research.

When citing data in the EMBL Database, we suggest to give the according primary accession number(s) and the publication in which the sequence first appeared. For unpublished data, we suggest to contact the original submitters for recent publication information or revisions of the data.

We suggest to also provide a reference for the EMBL Database itself. Our recent publication in Nucl. Acids Res., 1999, Vol. 27 (1), 18-24., which describes the EMBL database, should be cited:

Stoesser, G., Tuli, M.A., Lopez, R., and Sterk, P.. The EMBL Nucleotide Sequence Database Nucl. Acids Res., 27:18-24(1999)

Example: The numbers in parentheses refer to the REFERENCE in the EMBL database entry, and to the EMBL citation above.

"Sequence entry X56734 (1) has been retrieved from the EMBL Database (2) and showed significant sequence similarity to ..."

(1) Oxtoby E., et al., Plant Mol. Biol. 17:209-219(1991).
(2) Stoesser, G., et al., Nucl. Acids Res. 27:18-24(1999)

5 EBI NETWORK SERVICES

5.1 Electronic Mail Server

Computer users with access to Internet (directly or via a gateway) can obtain copies of database entries, documentation or the data submission form, by sending commands to a file server running on the computer systems at EBI. New and updated EMBL nucleotide sequence entries are made available on the server on a daily basis.

To use this facility, send file server commands (as electronic mail) to the address Netserv@EBI.AC.UK. Each line of the mail message should consist of a single file server request.

The most important file server request, to get started, is:

HELP

If the file server receives this command, it will return a help file to the sender, explaining in some detail how to use the facility. For example, to request a copy of  the nucleotide sequence with accession number X12399, use the commands:

GET NUC:X12399

The file server offers various other services, (eg., access to nucleotide and protein sequence data, protein structure data, software), details of which are provided in the HELP file.

5.2 Anonymous FTP Server

An alternative method of accessing the EBI archives is to use the Internet file transfer protocol (ftp). Researchers with direct access to the Internet can use the FTP program on their local machine to connect to the host FTP.EBI.AC.UK and enter the user name "anonymous" and their email address as password. The directory pub/help contains detailed information about the data available from the EBI anonymous FTP server which includes the complete EMBL Nucleotide Sequence Database releases as well as daily and weekly updates and a cumulative update file (in UNIX-compressed format) in the following directories:

EMBL quarterly release:   pub/databases/embl/release
EMBL updates:   pub/databases/embl/new

5.3 World Wide Web (WWW) Server

The EBI operates a WWW server with URL http://www.ebi.ac.uk/ which gives access to information about the EBI and it's products and services. Nucleotide sequences can be retrieved by a simple query by accession number, or more complex queries can be contructed using an SRS WWW databank browser. Nucleotide sequences can also be submitted to the database using the interactive submission system WebIn at URL:

http://www.ebi.ac.uk/emblSubmission/webin.html

5.4 Sequence Search Servers

The EBI offers two network servers for sequence similarity searches via electronic mail or interactive WWW forms:
FASTA based on W. Pearson's FASTA algorithm. Allows local similarity searches of protein and nucleotide sequence databases. Send "help" to fasta@ebi.ac.uk  or use URL http://www.ebi.ac.uk/fasta33/
BLAST based on the NCBI and WU-BLAST software Send "help" to blast@ebi.ac.uk   or use URL http://www.ebi.ac.uk/blast2/
BLITZ BLITZ allows very fast searches of protein sequence databases for local similarities using an exhaustive Smith-Waterman matching algorithm. Compugen's BIC_SW software is running on a Biocellerator (BIC-2) Send "help" to Blitz@EBI.AC.UK  or use URL  http://www.ebi.ac.uk/bic_sw/

6 DISTRIBUTION FILES

6.1 Release 61 Files
 

The release contains the files shown below, in the order listed. File sizes are given as numbers of records.

File Number

File Name

Description

Number of Records

1 DELETEAC.TXT Deleted accession numbers 32574
2 ACNUMBER.NDX  accession  numbers                                     5350598
3 CITATION.NDX Citation Index 728141
4 DIVISION.NDX Division Index 23
5 KEYWORD.NDX Keyword index                                     1994758
6 SHORTDIR.NDX Short Directory Index 12854551
7 SPECIES.NDX Species index                                     1857007
8 EST1.DAT EST Sequences 6917140
9 EST2.DAT EST Sequences 6868828
10 EST3.DAT EST Sequences 6918600
11 EST4.DAT EST Sequences 6762605
12 EST5.DAT EST Sequences 6841235
13 EST6.DAT EST Sequences 6877091
14 EST7.DAT EST Sequences 6614170
15 EST8.DAT EST Sequences 6655889
16 EST9.DAT EST Sequences 6452009
17 EST10.DAT EST Sequences 6816372
18 EST11.DAT EST Sequences 6886486
19 EST12.DAT EST Sequences 6922015
20 EST13.DAT EST Sequences 6956466
21 EST14.DAT EST Sequences 7043033
22 EST15.DAT EST Sequences 6672696
23 EST16.DAT EST Sequences 6264962
24 EST17.DAT EST Sequences 6910980
25 EST18.DAT EST Sequences 7692962
26 EST19.DAT EST Sequences 9798091
27 EST20.DAT EST Sequences 7920006
28 EST21.DAT EST Sequences 7206489
29 EST22.DAT EST Sequences 6048967
30 EST23.DAT EST Sequences 5590064
31 EST24.DAT EST Sequences 6582879
32 EST25.DAT EST Sequences 6216954
33 EST26.DAT EST Sequences 5690325
34 EST27.DAT EST Sequences 5720526
35 EST28.DAT EST Sequences 6412340
36 EST29.DAT EST Sequences 6732959
37 EST30.DAT EST Sequences 6336548
38 EST31.DAT EST Sequences 7081695
39 EST32.DAT EST Sequences 7038538
40 EST33.DAT EST Sequences 6773524
41 EST34.DAT EST Sequences 2980098
42 FUN.DAT Fungi Sequences 3244162
43 GSS1.DAT Genome Survey Sequences 6106747
44 GSS2.DAT Genome Survey Sequences 6066673
45 GSS3.DAT Genome Survey Sequences 6225473
46 GSS4.DAT Genome Survey Sequences 6610123
47 GSS5.DAT Genome Survey Sequences 6414584
48 GSS6.DAT Genome Survey Sequences 6538457
49 GSS7.DAT Genome Survey Sequences 6506858
50 GSS8.DAT Genome Survey Sequences 6485960
51 GSS9.DAT Genome Survey Sequences 6919213
52 GSS10.DAT Genome Survey Sequences 6201759
53 GSS11.DAT Genome Survey Sequences 6123524
54 GSS12.DAT Genome Survey Sequences 1903117
55 HTG1.DAT High Throughput Genome Sequences 8254798
56 HTG2.DAT High Throughput Genome Sequences 5965845
57 HTG3.DAT High Throughput Genome Sequences 6243891
58 HUM1.DAT Human Sequences 8409778
59 HUM2.DAT Human Sequences 4158106
60 HUM3.DAT Human Sequences 2627520
61 HUM4.DAT Human Sequences 2072299
62 HUM5.DAT Human Sequences 152714
63 INV.DAT Invertebrate Sequences 5883751
64 MAM.DAT Other Mammal Sequences 1556006
65 ORG.DAT Organelle Sequences 3805823
66 PATENT.DAT Patent Sequences 7343825
67 PHG.DAT Bacteriophage Sequences 192470
68 PLN.DAT Plant Sequences 5342838
69 PRO1.DAT Prokaryote Sequences 6022265
70 PRO2.DAT Prokaryote Sequences 1911256
71 ROD.DAT Rodent Sequences 4102930
72 STS.DAT STS Sequences 5755715
73 SYN.DAT Synthetic Sequences 330695
74 UNC.DAT Unclassified Sequences 122805
75 VRL.DAT Viral Sequences 5986921
76 VRT.DAT Other Vertebrate Sequences 1499665

 

6.2 SRS Indices

SRS indices can be found on the FTP server in the srs directory ftp://ftp.ebi.ac.uk/pub/databases/embl/release/srs/. Please read the README file for details

APPENDIX A

DATABASE GROWTH TABLE

The following table shows the growth of the EMBL Nucleotide Sequence Database at each release.

Release 

Month 

Entries 

Nucleotides 

1 06/1982         568         585433
2 04/1983         811       1114447
3 12/1983       1481       1654863
4 08/1984       1698       2147205
5 04/1985       2378       2874493
6 08/1985       4835       4567592
7 12/1985       5789       5622638
8 04/1986       6395       6353040
9 09/1986       7630       7813214
10 12/1986       8817       9766948
11 04/1987     11621     12189783
12 07/1987     12706     13638061
13 10/1987     14397     16023478
14 01/1988     15344     17272160
15 05/1988     17961     20318442
16 08/1988     19592     22625941
17 11/1988     20695     24211054
18 02/1989     22938     27249830
19 05/1989     24365     29066676
20 08/1989     26223     31240948
21 11/1989     28679     34748087
22 02/1990     31508     38165786
23 05/1990     34902     42923803
24 08/1990     37784     47354438
25 11/1990     41580     52900354
26 02/1991     43745     55859549
27 05/1991     46871     59915244
28 09/1991     54558     70448052
29 12/1991       5765     75400487
30 03/1992     63378     83574342
31 06/1992     72481     94390065
32 09/1992     79377   101292310
33 12/1992     89100   111413979
34 03/1993     99591   121420828
35 06/1993   108973   131880111
36 09/1993   127933   145401156
37 12/1993   146576   158171400
38 03/1994   167777   177550115
39 06/1994   182615   192195819
40 09/1994   209352   211017104
41 12/1994   230950   226259607
42 03/1995   303206   262559786
43 06/1995   420111   315840053
44 09/1995   506190   363273777
45 12/1995   622566   427620278
46 03/1996   701246   473691480
47  06/1996   827174   550739395
48 09/1996   928067   608931850
49 12/1996 1047263   696183789
50 03/1997 1187455   789755858
51 06/1997 1432941   931351601
52 10/1997 1787004 1181167498
53 12/1997 1917868 1281391651
54 03/1998 2125225 1427634373
55 06/1998 2330040 1607673907
56 09/1998 2689618 1904091473
57 12/1998 3046471 2164718256
58 03/1999 3272064 2355200790
59 06/1999 3952878 2924568545
60 09/1999 4719266 3543553093
61 12/1999 5303436 4508169737