Detailed Indexing Statistics: 1965-2011
MEDLINE® consists of completed citations indexed with MeSH® (Medical Subject Headings®).
| Fiscal Year (Oct. 1-Sep. 30) |
Number of Journals Indexed in Index Medicus |
Number of Journals in MEDLINE |
Number of Citations in MEDLINE |
Total Citations* |
|---|---|---|---|---|
| 2011 | 4,946 | 5,559 | 724,831 | 19,155,303 |
| 2010 | 4,866 | 5,484 | 699,420 | 18,340,055 |
| 2009 | 4,759 | 5,394 | 712,675 | 17,641,559 |
| 2008 | 4,660 | 5,319 | 671,904 | 16,888,640 |
| 2007 | 4,530 | 5,194 | 670,943 | 16,113,221** |
| 2006 | 4,416 | 5,020 | 623,089 | 14,103,589 |
| 2005 | 4,279 | 4,928 | 606,000 | 13,476,222 |
| 2004 | 4,189 | 4,839 | 571,000 | -- |
| 2003 | 3,934 | 4,697 | 526,000 | -- |
| 2002 | 3,834 | 4,538 | 502,000 | -- |
| 2001 | 3,636 | 4,537 | 463,000 | -- |
| 2000 | 3,472 | 4,332 | 442,000 | 10,796,185 |
| 1999 | 3,394 | 4,261 | 434,000 | -- |
| 1998 | 3,302 | 3,931 | 411,921 | -- |
| 1997 | 3,211 | 3,874 | 519,012 | -- |
| 1996 | 3,205 | 3,868 | 322,825 | -- |
| 1995 | 3,147 | 3,823 | 392,354 | 8,665,427 |
| 1994 | 3,127 | -- | 367,877 | -- |
| 1993 | 3,058 | -- | 376,312 | -- |
| 1992 | 3,048 | -- | 401,562 | -- |
| 1991 | 3,020 | -- | 363,344 | -- |
| 1990 | 2,973 | -- | 391,172 | 6,769,918 |
| 1989 | 2,888 | -- | 372,806 | -- |
| 1988 | 2,855 | -- | 329,019 | -- |
| 1987 | 2,786 | -- | 326,162 | -- |
| 1986 | 2,740 | -- | 316,585 | -- |
| 1985 | 2,730 | -- | 307,333 | 5,029,234 |
| 1984 | 2,695 | -- | 306,263 | -- |
| 1983 | 2,709 | -- | 310,445 | -- |
| 1982 | 2,697 | -- | 282,950 | -- |
| 1981 | 2,664 | -- | 279,105 | -- |
| 1980 | 2,661 | -- | 266,730 | 3,543,128 |
| 1979 | 2,595 | -- | 254,210 | -- |
| 1978 | 2,543 | -- | 232,563 | -- |
| 1977 | 2,525 | -- | 259,980 | -- |
| 1976 | 2,410 | -- | 320,700 | -- |
| 1975 | 2,353 | -- | 220,800 | 2,208,945 |
| 1974 | 2,275 | -- | 224,318 | -- |
| 1973 | 2,194 | -- | 207,816 | -- |
| 1972 | 2,246 | -- | 233,377 | -- |
| 1971 | 2,199 | -- | 224,619 | -- |
| 1970 | 2,251 | -- | 210,000 | 1,098,015 |
| 1969 | 2,260 | -- | 210,602 | -- |
| 1968 | 2,246 | -- | 192,923 | -- |
| 1967 | 2,279 | -- | 168,310 | -- |
| 1966 | 2,436 | -- | 164,545 | -- |
| 1965 | 2,241 | -- | 151,635 | -- |
*Older citations are periodically both added to PubMed® and converted to MEDLINE status, effective December 2006 forward; this practice accounts for the "extra" citations beyond the current citations added to MEDLINE in Fiscal Year 2007 forward.
**Includes about 1.3 million citations from the OLDMEDLINE conversion project for which all the original subject headings were mapped to current MeSH and the citation status was changed to MEDLINE in December 2006.
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