Skip to main page content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation

Search Page

Filters

My NCBI Filters

Results by year

Table representation of search results timeline featuring number of search results per year.

Year Number of Results
1960 1
1966 15
1967 32
1968 31
1969 31
1970 35
1971 36
1972 51
1973 152
1974 209
1975 362
1976 462
1977 420
1978 488
1979 502
1980 575
1981 530
1982 593
1983 704
1984 701
1985 745
1986 853
1987 1256
1988 2496
1989 3314
1990 3717
1991 3502
1992 3963
1993 4623
1994 4845
1995 4959
1996 5308
1997 6016
1998 6359
1999 6421
2000 7349
2001 7588
2002 8021
2003 9058
2004 9692
2005 10655
2006 11455
2007 12205
2008 13032
2009 13899
2010 15409
2011 16741
2012 18632
2013 19510
2014 20605
2015 21695
2016 20929
2017 20973
2018 20985
2019 20658
2020 18592
2021 13325
2022 3492
2023 2209
2024 4732

Text availability

Article attribute

Article type

Publication date

Search Results

363,373 results

Results by year

Filters applied: . Clear all
Page 1
363,373 results
You have reached the last available page of results. Please see the User Guide for more information.
-