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

Year Number of Results
1974 1
1975 1
1976 1
1979 2
1981 1
1983 2
1985 1
1986 2
1988 1
1989 3
1990 1
1991 3
1994 2
1996 4
2001 1
2002 1
2003 2
2004 3
2005 7
2006 8
2007 12
2008 12
2009 9
2010 7
2011 8
2012 16
2013 20
2014 19
2015 20
2016 15
2017 12
2018 17
2019 19
2020 21
2021 6
Text availability
Article attribute
Article type
Publication date

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221 results
Results by year
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221 results
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