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

Year Number of Results
1979 1
1981 1
1983 1
1985 1
1987 2
1989 4
1990 1
1992 1
1993 1
1994 6
1995 15
1996 19
1997 26
1998 12
1999 10
2000 14
2001 10
2002 9
2003 19
2004 22
2005 14
2006 13
2007 20
2008 20
2009 15
2010 25
2011 35
2012 25
2013 22
2014 22
2015 27
2016 36
2017 44
2018 38
2019 28
2020 53
2021 21
Text availability
Article attribute
Article type
Publication date

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563 results
Results by year
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563 results
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