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Detailed Indexing Statistics: 1965-2013

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 Citations1
2013 5,067 5,6403 734,052 20,695,240
2012 5,025 5,633 760,903 19,974,272
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    16,113,2212
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 --

1Older 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.

2Includes 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.

3The small net increase results from identification of journals that have ceased publication or for which NLM is no longer receiving citation data electronically; it does not mean that fewer new jouranls were recommended for indexing.

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