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MEDLINE® Citation Counts by Year of Publication
(as of mid - November 2015)*

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

Year of Publication Total # Citations # Citations Published in US %s Citations Published in US
2015* 246,372 116,665 47%
2014 811,002 344,358 42%
2013 847,333 361,742 43%
2012 809,155 348,503 43%
2011 766,523 330,247 43%
2010 733,763 316,107 43%
2009 707,106 310,552 44%
2008 685,807 305,187 45%
2007 657,200 292,490 45%
2006 634,318 286,170 45%
2005 609,210 278,162 46%
2004 578,814 266,335 46%
2003 549,046 255,883 47%
2002 521,391 243,253 47%
2001 505,788 238,351 47%
2000 485,457 228,649 47%
1999 459,742 217,511 47%
1998 446,885 211,425 47%
1997 432,082 205,515 48%
1996 421,876 200,029 47%
1995 416,501 198,037 48%
1994 407,341 191,705 47%
1993 398,126 185,022 46%
1992 391,836 179,339 46%
1991 388,803 173,913 45%
1990 388,195 169,357 44%
1989 381,408 162,358 43%
1988 365,617 155,221 42%
1987 348,009 146,180 42%
1986 330,463 138,805 42%
1985 318,101 131,805 41%
1984 307,942 127,414 41%
1983 299,031 122,932 41%
1982 285,224 116,236 41%
1981 274,485 109,795 40%
1980 272,513 107,729 40%
1979 274,295 107,001 39%
1978 265,557 101,151 38%
1977 255,748 95,937 38%
1976 249,191 91,583 37%
1975 244,112 87,254 36%
1974 229,846 80,767 35%
1973 225,880 77,337 34%
1972 222,189 72,719 33%
1971 217,580 69,789 32%
1970 212,366 67,081 32%
1969 210,583 66,810 32%
1968 203,763 63,733 31%
1967 186,903 58,529 31%
1966 175,129 55,546 32%
1965 173,156 54,315 31%
1964 158,918 48,906 31%
1963** 137,757 NA NA
1962** 122,648 NA NA
1961** 117,007 NA NA
1960** 108,867 NA NA
1959** 107,792 NA NA
1958** 107,656 NA NA
1957** 109,811 NA NA
1956** 105,228 NA NA
1955** 106,760 NA NA
1954** 104,007 NA NA
1953** 107,679 NA NA
1952** 106,849 NA NA
1951** 102,580 NA NA
1950** 84,099 NA NA
1949** 60,931 NA NA
1948** 68,711 NA NA
1947** 62,893 NA NA
Pre-1947** 66,642 NA NA
1964-Present Subtotals 20,987,692 8,971,451 43%
Totals*** 22,775,609 NA NA

 

*Derived from the 2016 MEDLINE/PubMed Baseline produced in mid-November 2015. At that time, publication year 2015 was not complete and publication year 2016 had only 11 citations. Prior to the mid-November 2013 update, the statistics for this page were derived from PubMed searches.

**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 PubMed status or "as supplied by publisher" status. As of the 2016 MEDLINE/PubMed baseline, all OLDMEDLINE subset citations were converted to MEDLINE status because every such citation was mapped to at least one current MeSH heading. In the future when NLM adds more OLDMEDLINE citations, there may be a period of time when the citations status equals OLDMEDLINE until NLM can map to current MeSH.

Notes:
  1. Typically a PubMed search will yield higher numbers, as NLM may have processed more completed citations since the baseline was produced 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. Also, PubMed includes both the print and electronic publication dates in a publication date search. Therefore, citations to articles published electronically and in print with 2 different publication dates will be retrieved in 2 different [dp] searches, thereby getting counted twice. For example, a paper published electronically in December 2013 and in print in January 2014 will be counted once in a 2013 [dp] search and again in a 2014 [dp] search.
  2. Counts are limited to the MEDLINE subset [sb] of PubMed and do not include out-of-scope citations.
    To search PubMed for the out-of-scope completed citations use: pubmednotmedline [sb]
    To search PubMed for MEDLINE excluding OLDMEDLINE subset citations, add NOT jsubsetom to your search; for example: 1965 [dp] AND medline [sb] NOT jsubsetom.
  3. 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.