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MEDLINE® Citation Counts by Year of Publication
(as of mid - November 2013)*

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* 98 27 28%
2013* 351,522 165,127 47%
2012 777,559 341,388 44%
2011 758,918 328,001 43%
2010 729,889 314,919 43%
2009 705,078 310,117 44%
2008 684,676 305,008 45%
2007 656,419 292,407 45%
2006 633,738 286,092 45%
2005 608,680 278,057 46%
2004 578,572 266,178 46%
2003 548,712 255,716 47%
2002 521,223 243,249 47%
2001 505,594 238,342 47%
2000 485,435 228,589 47%
1999 459,656 217,481 47%
1998 446,886 211,422 47%
1997 432,045 205,504 48%
1996 421,843 200,028 47%
1995 416,500 198,035 48%
1994 407,330 191,706 47%
1993 398,106 185,000 46%
1992 391,820 179,319 46%
1991 388,803 173,912 45%
1990 388,194 169,343 44%
1989 381,408 162,324 43%
1988 365,606 155,169 42%
1987 348,009 146,115 42%
1986 330,452 138,676 42%
1985 318,100 131,692 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 272,511 107,606 39%
1979 274,268 106,895 39%
1978 265,544 101,055 38%
1977 255,741 95,845 37%
1976 249,192 91,534 37%
1975 244,085 87,217 36%
1974 229,846 80,729 35%
1973 225,880 77,317 34%
1972 222,188 72,690 33%
1971 217,569 69,737 32%
1970 212,444 67,043 32%
1969 210,584 66,796 32%
1968 203,764 63,723 31%
1967 186,885 58,503 31%
1966 175,083 55,500 32%
1965** 171,743 53,643 31%
1964** 156,385 47,741 31%
1963** 136,327 NA NA
1962** 111,441 NA NA
1961** 100,602 NA NA
1960** 94,352 NA NA
1959** 86,956 NA NA
1958** 79,085 NA NA
1957** 81,521 NA NA
1956** 78,690 NA NA
1955** 80,443 NA NA
1954** 79,188 NA NA
1953** 84,015 NA NA
1952** 86,928 NA NA
1951** 91,471 NA NA
1950** 78,764 NA NA
1949** 42,446 NA NA
1948** 31,470 NA NA
1947** 29,591 NA NA
Pre-1947** 31,164 NA NA
1966-2014* Subtotals 19,053,039 8,197,135 43%
Totals 20,785,621 ——— ———

 

*Derived from the 2014 MEDLINE/PubMed Baseline produced in mid-November 2013. At that time, publication year 2013 was not complete and publication year 2014 had only 98 citations. Prior to this 2014 update, the statistics for this page were derived from PubMed searches. Going forward, we will continue to derive these statistics from the MEDLINE/PubMed baselines produced annually in November. Compared to the 2013 statistics, there is a small decrease in the Number of Records counts for two reasons: a. using baseline data rather than PubMed searches (see also Note 1 below), and b. identifying and deleting duplicate citations in March 2013 (which mostly affected the counts prior to 1990).

**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.