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Results by year

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

Year Number of Results
1977 1
1978 2
1979 1
1980 3
1981 6
1982 7
1983 6
1984 2
1985 4
1986 17
1987 8
1988 10
1989 12
1990 21
1991 18
1992 25
1993 41
1994 42
1995 43
1996 60
1997 56
1998 82
1999 88
2000 95
2001 132
2002 163
2003 211
2004 237
2005 328
2006 358
2007 421
2008 468
2009 545
2010 706
2011 764
2012 871
2013 1049
2014 1262
2015 1392
2016 1495
2017 1564
2018 1724
2019 1930
2020 2174
2021 837
Text availability
Article attribute
Article type
Publication date

Search Results

17,262 results
Results by year
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