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
1902 1
1903 1
1909 1
1913 2
1916 1
1925 2
1928 1
1933 1
1934 1
1935 1
1936 4
1937 2
1938 6
1939 3
1940 3
1941 1
1942 2
1943 1
1945 163
1946 459
1947 418
1948 504
1949 316
1950 658
1951 551
1952 451
1953 1013
1954 1227
1955 1042
1956 772
1957 585
1958 642
1959 668
1960 809
1961 979
1962 1285
1963 3310
1964 5800
1965 4467
1966 2929
1967 3856
1968 4489
1969 4668
1970 4802
1971 5467
1972 5001
1973 4260
1974 4256
1975 3559
1976 2949
1977 2616
1978 2728
1979 2725
1980 2220
1981 2141
1982 2233
1983 2289
1984 2278
1985 2388
1986 2261
1987 2397
1988 2692
1989 2756
1990 2997
1991 3305
1992 3552
1993 3659
1994 3719
1995 4013
1996 4279
1997 4651
1998 4894
1999 5569
2000 6986
2001 8779
2002 9631
2003 11762
2004 14221
2005 16853
2006 18401
2007 19568
2008 21259
2009 23633
2010 26183
2011 28567
2012 29662
2013 30381
2014 31513
2015 32692
2016 33494
2017 33906
2018 34828
2019 37125
2020 36482
2021 36258
2022 28936
2023 26107
2024 9620

Text availability

Article attribute

Article type

Publication date

Search Results

685,879 results

Results by year

Filters applied: . Clear all
Page 1
685,879 results
You have reached the last available page of results. Please see the User Guide for more information.