Skip Navigation Bar
NLM logo

MEDLINE® Citation Counts by Year of Publication
(as of January 2019)*

PubMed logo
Go to PubMed

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
2018* 293,216 96,497 33%
2017 761,674 310,696 40%
2016 854,511 348,151 41%
2015 878,328 366,712 42%
2014 871,297 369,759 42%
2013 854,703 365,582 43%
2012 811,656 349,214 43%
2011 769,720 330,665 43%
2010 735,288 315,688 43%
2009 708,009 306,584 43%
2008 686,164 299,161 44%
2007 657,782 287,662 44%
2006 634,697 281,883 44%
2005 609,911 274,059 45%
2004 579,103 260,850 45%
2003 549,363 249,545 45%
2002 521,728 237,081 45%
2001 505,798 231,668 46%
2000 485,517 222,521 46%
1999 459,833 211,080 46%
1998 446,892 204,281 46%
1997 432,077 198,572 46%
1996 421,856 192,946 46%
1995 416,508 191,533 46%
1994 407,339 185,582 46%
1993 398,131 178,887 45%
1992 391,830 173,673 44%
1991 388,799 168,299 43%
1990 388,191 163,823 42%
1989 381,407 157,014 41%
1988 365,616 150,615 41%
1987 348,008 141,801 41%
1986 330,460 134,076 41%
1985 318,119 127,436 40%
1984 307,938 123,262 40%
1983 299,025 118,888 40%
1982 285,226 112,925 40%
1981 274,483 106,944 39%
1980 272,546 105,007 39%
1979 274,280 104,041 38%
1978 265,556 97,376 37%
1977 255,750 92,119 36%
1976 249,186 87,546 35%
1975 244,119 83,331 34%
1974 229,812 77,600 34%
1973 225,875 74,389 33%
1972 222,242 69,868 31%
1971 217,578 66,677 31%
1970 212,363 64,180 30%
1969 210,582 63,637 30%
1968 203,762 60,821 30%
1967 186,901 55,842 30%
1966 175,217 53,355 31%
1965 173,145 52,328 30%
1964 158,934 48,130 30%
1963** 137,734 NA NA
1962** 122,645 NA NA
1961** 117,003 NA NA
1960** 108,862 NA NA
1959** 107,792 NA NA
1958** 107,655 NA NA
1957** 109,811 NA NA
1956** 105,228 NA NA
1955** 106,760 NA NA
1954** 104,007 NA NA
1953** 107,678 NA NA
1952** 106,850 NA NA
1951** 102,578 NA NA
1950** 84,099 NA NA
1949** 60,931 NA NA
1948** 68,711 NA NA
1947** 62,869 NA NA
Pre-1947** 66,664 NA NA
1964-Present Subtotals 23,608,674 9,801,885 42%
Totals*** 25,396,551 NA NA

 

*Derived from the 2019 MEDLINE/PubMed Baseline produced in January 2019.

**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.

 

Last Reviewed: April 3, 2019