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MEDLINE® Citation Counts by Year of Publication
(as of mid - December 2016)*

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
2016* 194,487 86,037 44%
2015 828,127 349,982 42%
2014 863,297 365,250 42%
2013 853,423 363,765 43%
2012 811,631 348,445 43%
2011 769,663 330,232 43%
2010 735,229 315,072 43%
2009 708,040 306,273 43%
2008 686,217 298,928 44%
2007 657,794 287,252 44%
2006 634,696 281,729 44%
2005 609,911 273,444 45%
2004 579,122 260,076 45%
2003 549,365 248,719 45%
2002 521,718 236,371 45%
2001 505,796 230,925 46%
2000 485,521 221,739 46%
1999 459,828 210,166 46%
1998 446,896 203,341 46%
1997 432,111 197,663 46%
1996 421,863 191,981 46%
1995 416,511 190,546 46%
1994 407,340 184,729 45%
1993 398,134 177,924 45%
1992 391,836 172,878 44%
1991 388,802 167,462 43%
1990 388,195 163,134 42%
1989 381,408 156,178 41%
1988 365,617 149,967 41%
1987 348,010 141,240 41%
1986 330,462 133,589 40%
1985 318,117 127,012 40%
1984 307,942 122,896 40%
1983 299,032 118,590 40%
1982 285,225 112,645 39%
1981 274,486 106,699 39%
1980 272,546 104,618 38%
1979 274,283 103,770 38%
1978 265,558 97,010 37%
1977 255,753 91,937 36%
1976 249,191 87,298 35%
1975 244,120 83,181 34%
1974 229,817 77,388 34%
1973 225,879 74,278 33%
1972 222,247 69,815 31%
1971 217,581 66,691 31%
1970 212,366 64,177 30%
1969 210,584 63,706 30%
1968 203,764 60,921 30%
1967 186,904 55,932 30%
1966 175,218 53,504 31%
1965 173,147 52,325 30%
1964 158,945 48,073 30%
1963** 137,758 NA NA
1962** 122,649 NA NA
1961** 117,007 NA NA
1960** 108,868 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** 62,889 NA NA
Pre-1947** 66,646 NA NA
1964-Present Subtotals 21,833,755 9,087,503 42%
Totals*** 23,621,675 NA NA

 

*Derived from the 2017 MEDLINE/PubMed Baseline produced in mid-December 2016.

**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.