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Results by year

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

Year Number of Results
1971 2
1973 2
1975 1
1979 1
1980 1
1981 2
1982 1
1983 4
1985 2
1986 5
1987 5
1988 10
1989 7
1990 8
1991 10
1992 8
1993 11
1994 13
1995 7
1996 10
1997 19
1998 13
1999 23
2000 15
2001 15
2002 24
2003 17
2004 26
2005 19
2006 32
2007 25
2008 37
2009 50
2010 60
2011 68
2012 86
2013 75
2014 95
2015 99
2016 80
2017 107
2018 125
2019 139
2020 32
Text availability
Article attribute
Article type
Publication date

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1,232 results
Results by year
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