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MEDLINE® Citation Counts by Year of Publication

MEDLINE consists of completed citations indexed with MeSH® (Medical Subject Headings®).

Years of publication Total # Citations # Citations Published in US % Citations Published in US
2012* 591,054 268,141 45%
2011 872,766 370,256 42%
2010 838,539 354,201 42%
2009 793,985 340,613 43%
2008 766,678 333,901 44%
2007 729,238 317,353 44%
2006 694,148 305,331 44%
2005 650,157 291,177 45%
2004 595,260 273,270 46%
2003 558,165 260,872 47%
2002 526,810 246,603 47%
2001 508,594 240,007 47%
2000 486,909 229,968 47%
1999 459,645 217,471 47%
1998 446,886 211,425 47%
1997 432,050 205,511 48%
1996 421,840 200,034 47%
1995 416,522 198,041 48%
1994 407,376 191,732 47%
1993 398,159 185,024 46%
1992 391,853 179,334 46%
1991 388,830 173,924 45%
1990 388,229 169,356 44%
1989 381,459 162,346 43%
1988 365,676 155,187 42%
1987 348,035 146,129 42%
1986 330,485 138,698 42%
1985 318,114 131,698 41%
1984 307,951 127,293 41%
1983 299,080 122,841 41%
1982 285,281 116,181 41%
1981 274,543 109,714 40%
1980 272,615 107,622 39%
1979 274,310 106,912 39%
1978 265,583 101,080 38%
1977 255,860 95,938 37%
1976 249,371 91,617 37%
1975 244,342 87,282 36%
1974 230,227 80,896 35%
1973 226,486 77,466 34%
1972 222,517 72,805 33%
1971 218,051 70,023 32%
1970 212,751 67,165 32%
1969 210,910 66,992 32%
1968 204,072 63,843 31%
1967 187,111 58,586 31%
1966 175,294 55,537 32%
1965** 171,834 53,658 31%
1964** 156,389 47,741 31%
1963** 136,328 NA NA
1962** 111,441 NA NA
1961** 100,603 NA NA
1960** 94,352 NA NA
1959** 86,956 NA NA
1958** 79,085 NA NA
1957** 81,521 NA NA
1956** 78,692 NA NA
1955** 80,441 NA NA
1954** 79,188 NA NA
1953** 84,000 NA NA
1952** 86,943 NA NA
1951** 91,471 NA NA
1950** 78,764 NA NA
1949** 42,446 NA NA
1948** 31,470 NA NA
1947** 29,591 NA NA
Pre-1947** 31,164 NA NA
1964-2012 Subtotals 18,835,630 8,058,925 43%
Totals*** 20,240,086 ——— ———

 

*Searches were done in PubMed® on February 19, 2013.

**As of December 2006, OLDMEDLINE subset citations that have all of their original subject terms mapped to current MeSH are included in MEDLINE. There are more citations in PubMed with these older publication dates; some are OLDMEDLINE status, but some are PubMed status or "as supplied by publisher" status.

***PubMed includes both the print and electronic publication dates in a publication date search; therefore, citations may be counted under more than one year. The totals do not include these duplicates.

Notes:
- Any search repeated on a later day may yield different results (typically higher numbers, as NLM may have processed more completed citations for various reasons, e.g., time lag in receipt, or a new journal for indexing going back to volume 1, or data from back issues such as those deposited in PubMed Central, or from other sources).
- Counts are limited to the MEDLINE subset [sb] of PubMed and do not include out-of-scope citations. To search PubMed for MEDLINE excluding OLDMEDLINE subset citations, add NOT jsubsetom to your search.
- Country of publication means the country where the journal was published. These data are available for the OLDMEDLINE subset only for the years 1964-65.