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MEDLINE®: Number of Citations to English Language Articles; Number of Citations Containing Abstracts1

Years of Publication Total # Records # English (%) # Non-English (%) # with Abstracts (%)2
2010-2012* 2,076,857 1,933,733 ( 93% ) 143,124 ( 7% ) 1,751,995 ( 84% )
2005-2009 3,379,266 3,067,112 ( 91% ) 312,154 ( 9% ) 2,803,941 ( 83% )
2000-2004 2,656,032 2,371,548 ( 89% ) 284,484 ( 11% ) 2,093,814 ( 79% )
1995-1999 2,176,943 1,908,769 ( 88% ) 268,174 ( 12% ) 1,638,757 ( 75% )
1990-1994 1,974,447 1,652,319 ( 84% ) 322,128 ( 16% ) 1,438,881 ( 73% )
1985-1989 1,743,769 1,349,755 ( 77% ) 394,014 ( 23% ) 1,067,739 ( 61% )
1980-1984 1,439,470 1,069,322 ( 74% ) 370,148 ( 26% ) 724,312 ( 50% )
1975-1979 1,289,466 894,779 ( 69% ) 394,687 ( 31% ) 533,579 ( 41% )
1970-1974 1,110,032 695,569 ( 63% ) 414,463 ( 37% ) 40,399 ( 4% )
1965-1969 949,221 518,181 ( 55% ) 431,040 ( 45% ) 20,385 ( 2% )
1960-1964** 599,113 291,152 ( 49% ) 307,961 ( 51% ) 7,934 ( 1% )
1955-1959** 406,695 193,396 ( 48% ) 213,299 ( 52% ) 2,177 ( 1% )
1950-1954** 420,366 193,584 ( 46% ) 226,782 ( 54% ) 1,256 ( <1% )
pre-1950** 134,671 84,469 ( 63% ) 50,202 ( 37% ) 345 ( <1% )
Totals*** 20,247,498 16,116,651 ( 80% ) 4,130,847 ( 20% ) 12,023,738 ( 59% )

1Includes author abstracts (in AB field) or abstracts written by someone other than the author (in OAB, Other Abstract field).

2Structured Abstracts: about 25% of abstracts added yearly are structured abstracts.

*Based on searches performed in PubMed® (limited to MEDLINE which consists of completed citations indexed with MeSH®) on February 22, 2013. Publication year 2012 is not yet complete.

**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.

***PubMed includes both the print and electronic publication dates in a publication date search; therefore, citations may be counted under more than one year. The totals do not include these duplicates.

NLM began to include abstracts routinely in online citations in 1975. Abstracts in earlier years largely come from NLM collaborating partners and some projects to load data from back issues (such as from PubMed Central and other sources). When adding missing citations (gaps) in the OLDMEDLINE range of years (pre-1966), abstracts, if present in the original article, are now included.