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Key MEDLINE® Indicators

  FY2017 % Change FY2016 % Change FY2015 % Change FY2014 % Change FY2013 % Change
MEDLINE Citations Indexed 813,598 -6.5% 869,666 +8% 806,326 +5% 765,850 +4% 734,052 -3.5%
MEDLINE/PubMed® Searches 3.3 Billion +6.4% 3.1 Billion +14% 2.8 Billion +4% 2.7 Billion +8% 2.5 Billion +14%
     Sub-Total Web/Interactive 846Million -0.8% 853 Million -6% 910 Million +1% 900 Million -3% 932 Million 0%
     Sub-Total Script/E-Utilities 2.5 Billion +13.6% 2.2 Billion +21% 1.9 Billion +6% 1.8 Billion +13% 1.6 Billion +23%
MEDLINE Journal Titles 5,617 -0.1 % 5,623 +0.1% 5,618 -0.5% 5,647 +0.1% 5,640 +0.1%
Index Medicus Journal Titles 5,150 +0.3 % 5,136 +0.3% 5,123 +0.1% 5,118 +1% 5,067 +0.8%
Total Citation Data Creation2 n/a n/a 1,020,678 -10% 879,709 -10% 981,783 +6% 926,479 +6%
     OCRed Citations n/a n/a 39,051 -21% 43,864 -21% 55,222 -8% 60,019 -4%
     Citations Received as XML2 n/a n/a 981,627 -10% 835,845 -10% 926,561 +7% 866,460 +7%
Retraction Notices n/a n/a 641 +41% 666 +41% 473 +15% 410 +18%
Retracted Articles n/a n/a 664 +37% 684 +37% 500 +75% 467 +25%
Partial Retraction1 Notices n/a n/a n/a n/a 4 +400% 0 -100% 3 +200%
Partially Retracted1 Articles n/a n/a n/a n/a 4 +400% 0 -100% 3 +200%
Errata2 n/a n/a 8,992 -27% 12,344 +29% 9,602 +5% 9,178 +13%
Comments2 n/a n/a 47,906 -9% 52,921 -7% 56,652 +16% 48,714 +31%
Gene Indexing 88,397 +2.2% 86,458 +3% 83,734 +7% 78,491 -8% 85,429 -4%

 

See also additional MEDLINE statistics.

Prior Years:
2010-2012
2005-2009
2000-2004
1996-1999

The U.S. Government Fiscal Year (FY) runs from October 1 - September 30.
Not all footnotes apply to archived years.

  1. NLM began to report partial retractions separately in December 2006; discontinued in September 2016.
  2. Due to a system reinvention implemented in FY2017, this data is not yet available.

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