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

Year Number of Results
1978 2
1979 1
1980 6
1981 4
1982 3
1983 3
1984 2
1985 1
1986 3
1987 6
1988 5
1989 20
1990 10
1991 19
1992 11
1993 20
1994 15
1995 21
1996 18
1997 29
1998 24
1999 22
2000 25
2001 28
2002 15
2003 20
2004 16
2005 13
2006 30
2007 21
2008 13
2009 18
2010 15
2011 12
2012 15
2013 15
2014 7
2015 12
2016 14
2017 10
2018 11
2019 6
2020 2
Text availability
Article attribute
Article type
Publication date

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543 results
Results by year
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