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MEDLINE® Citation Counts by Year of Publication
(as of mid - December 2017)*

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
2017* 285,604 132,641 46%
2016 687,560 278,341 40%
2015 874,084 365,375 42%
2014 868,382 368,742 42%
2013 854,099 365,655 43%
2012 811,154 349,069 43%
2011 769,217 330,678 43%
2010 734,764 315,425 43%
2009 707,515 306,624 43%
2008 685,655 299,254 44%
2007 657,260 287,604 44%
2006 634,207 282,078 44%
2005 609,461 273,825 45%
2004 578,651 260,542 45%
2003 548,839 249,022 45%
2002 521,255 236,713 45%
2001 505,542 231,327 46%
2000 485,460 222,146 46%
1999 459,772 210,597 46%
1998 446,834 203,907 46%
1997 432,077 198,110 46%
1996 421,813 192,374 46%
1995 416,466 190,980 46%
1994 407,262 185,126 45%
1993 398,052 178,330 45%
1992 391,744 173,185 44%
1991 388,680 167,718 43%
1990 388,017 163,381 42%
1989 381,180 156,464 41%
1988 365,393 150,142 41%
1987 347,808 141,366 41%
1986 330,327 133,702 40%
1985 317,963 127,129 40%
1984 307,828 122,989 40%
1983 299,903 118,637 40%
1982 285,132 112,962 40%
1981 274,408 106,735 39%
1980 272,433 104,749 38%
1979 274,118 103,766 38%
1978 265,469 97,144 37%
1977 255,746 91,963 36%
1976 249,184 87,383 35%
1975 244,114 83,186 34%
1974 229,813 77,390 34%
1973 225,868 74,277 33%
1972 222,240 69,806 31%
1971 217,576 66,685 31%
1970 212,359 64,161 30%
1969 210,581 63,696 30%
1968 203,761 60,903 30%
1967 186,901 55,923 30%
1966 175,217 53,490 31%
1965 173,145 52,444 30%
1964 158,944 48,282 30%
1963** 137,746 NA NA
1962** 122,648 NA NA
1961** 117,004 NA NA
1960** 108,862 NA NA
1959** 107,790 NA NA
1958** 107,653 NA NA
1957** 109,811 NA NA
1956** 105,228 NA NA
1955** 106,759 NA NA
1954** 104,003 NA NA
1953** 107,669 NA NA
1952** 106,844 NA NA
1951** 102,575 NA NA
1950** 84,099 NA NA
1949** 60,931 NA NA
1948** 68,711 NA NA
1947** 62,887 NA NA
Pre-1947** 66,645 NA NA
1964-Present Subtotals 22,656,186 9,443,984 42%
Totals*** 24,444,051 NA NA

 

*Derived from the 2018 MEDLINE/PubMed Baseline produced in mid-December 2017.

**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 2017 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.