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

Year Number of Results
1915 169
1916 177
1917 169
1918 92
1919 106
1920 139
1921 81
1922 98
1923 111
1924 123
1925 195
1926 173
1927 201
1928 210
1929 192
1930 151
1931 141
1932 148
1933 198
1934 153
1935 150
1936 147
1937 134
1938 118
1939 142
1940 142
1941 128
1942 115
1943 80
1944 79
1945 83
1946 71
1947 83
1948 110
1949 129
1950 125
1951 157
1952 184
1953 199
1954 206
1955 206
1956 191
1957 171
1958 206
1959 234
1960 238
1961 289
1962 354
1963 361
1964 472
1965 542
1966 549
1967 643
1968 641
1969 600
1970 632
1971 723
1972 851
1973 847
1974 1098
1975 1107
1976 1010
1977 1248
1978 1357
1979 1424
1980 1612
1981 1670
1982 1672
1983 1618
1984 1695
1985 1848
1986 2044
1987 1916
1988 2035
1989 2095
1990 2077
1991 2392
1992 2514
1993 2484
1994 2681
1995 2551
1996 2820
1997 2681
1998 2821
1999 2762
2000 2655
2001 2812
2002 3113
2003 2963
2004 3331
2005 3447
2006 3594
2007 3720
2008 3832
2009 4278
2010 4278
2011 4111
2012 4389
2013 4619
2014 4258
2015 4154
2016 3939
2017 4024
2018 4069
2019 4150
2020 4375
2021 3211
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146,122 results
Results by year
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Revisiting the sedimentary record of the rise of diatoms.
Westacott S, Planavsky NJ, Zhao MY, Hull PM. Westacott S, et al. Proc Natl Acad Sci U S A. 2021 Jul 6;118(27):e2103517118. doi: 10.1073/pnas.2103517118. Proc Natl Acad Sci U S A. 2021. PMID: 34183398
The origin of cooperation.
Koduri N, Lo AW. Koduri N, et al. Proc Natl Acad Sci U S A. 2021 Jun 29;118(26):e2015572118. doi: 10.1073/pnas.2015572118. Proc Natl Acad Sci U S A. 2021. PMID: 34172574 Free PMC article.
The archaeology of climate change: The case for cultural diversity.
Burke A, Peros MC, Wren CD, Pausata FSR, Riel-Salvatore J, Moine O, de Vernal A, Kageyama M, Boisard S. Burke A, et al. Proc Natl Acad Sci U S A. 2021 Jul 27;118(30):e2108537118. doi: 10.1073/pnas.2108537118. Proc Natl Acad Sci U S A. 2021. PMID: 34301875 Free PMC article.
Evolution in pecunia.
Amir R, Evstigneev IV, Hens T, Potapova V, Schenk-Hoppé KR. Amir R, et al. Proc Natl Acad Sci U S A. 2021 Jun 29;118(26):e2016514118. doi: 10.1073/pnas.2016514118. Proc Natl Acad Sci U S A. 2021. PMID: 34172577 Free PMC article.
Microbe-dependent heterosis in maize.
Wagner MR, Tang C, Salvato F, Clouse KM, Bartlett A, Vintila S, Phillips L, Sermons S, Hoffmann M, Balint-Kurti PJ, Kleiner M. Wagner MR, et al. Proc Natl Acad Sci U S A. 2021 Jul 27;118(30):e2021965118. doi: 10.1073/pnas.2021965118. Proc Natl Acad Sci U S A. 2021. PMID: 34285069
146,122 results
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