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MEDLINE® Citation Counts by Year of Publication
(as of mid - November 2014)*

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

Years of publication Total # Citations # Citations Published in US % Citations Published in US
2014* 295,252 136,721 46%
2013 809,636 349,688 43%
2012 802,026 347,297 43%
2011 762,959 329,436 43%
2010 731,760 315,534 43%
2009 706,217 310,246 44%
2008 685,103 305,087 45%
2007 656,794 292,443 45%
2006 633,960 286,092 45%
2005 608,943 278,103 46%
2004 578,675 266,192 46%
2003 548,766 255,717 47%
2002 521,232 243,249 47%
2001 505,641 238,342 47%
2000 485,456 228,599 47%
1999 459,667 217,481 47%
1998 446,885 211,419 47%
1997 432,049 205,508 48%
1996 421,876 200,029 47%
1995 416,500 198,035 48%
1994 407,330 191,706 47%
1993 398,106 185,000 46%
1992 391,828 179,327 46%
1991 388,803 173,912 45%
1990 388,194 169,343 44%
1989 381,408 162,324 43%
1988 365,617 155,180 42%
1987 348,009 146,115 42%
1986 330,463 138,686 42%
1985 318,101 131,693 41%
1984 307,940 127,319 41%
1983 299,031 122,836 41%
1982 285,155 116,151 41%
1981 274,458 109,696 40%
1980 272,513 107,608 39%
1979 274,295 106,922 39%
1978 265,557 101,068 38%
1977 255,748 95,852 37%
1976 249,193 91,534 37%
1975 244,085 87,217 36%
1974 229,846 80,729 35%
1973 225,879 77,316 34%
1972 222,189 72,691 33%
1971 217,566 69,737 32%
1970 212,447 67,043 32%
1969 210,583 66,795 32%
1968 203,763 63,722 31%
1967 186,903 58,514 31%
1966 175,070 55,487 32%
1965 171,771 53,667 31%
1964 156,748 48,097 31%
1963** 136,537 NA NA
1962** 115,572 NA NA
1961** 107,166 NA NA
1960** 100,336 NA NA
1959** 93,545 NA NA
1958** 86,258 NA NA
1957** 88,719 NA NA
1956** 86,153 NA NA
1955** 89,110 NA NA
1954** 87,777 NA NA
1953** 92,155 NA NA
1952** 94,269 NA NA
1951** 95,885 NA NA
1950** 82,084 NA NA
1949** 49,566 NA NA
1948** 41,292 NA NA
1947** 38,293 NA NA
Pre-1947** 41,755 NA NA
1964-Present Subtotals 20,168,011 8,628,511 43%
Totals*** 21,694,483 ——————

 

*Derived from the 2015 MEDLINE/PubMed Baseline produced in mid-November 2014. At that time, publication year 2014 was not complete and publication year 2015 had only 15 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 OLDMEDLINE status, but some are PubMed status or "as supplied by publisher" status.

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 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.