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

Year Number of Results
1976 1
1977 5
1978 1
1981 1
1982 3
1983 4
1984 4
1985 2
1986 4
1987 2
1988 2
1989 2
1990 8
1991 4
1992 2
1993 6
1994 9
1995 9
1996 6
1997 8
1998 14
1999 13
2000 11
2001 19
2002 15
2003 19
2004 26
2005 27
2006 12
2007 29
2008 31
2009 25
2010 33
2011 28
2012 27
2013 36
2014 41
2015 27
2016 27
2017 27
2018 27
2019 22
2020 3
Text availability
Article attribute
Article type
Publication date

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571 results
Results by year
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