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

Year Number of Results
1967 1
1968 1
1970 1
1971 1
1972 6
1973 1
1974 3
1975 2
1976 2
1982 1
1992 1
1993 1
1994 1
1995 3
1996 6
1997 3
1998 5
1999 3
2000 4
2001 3
2002 4
2003 9
2004 6
2005 13
2006 26
2007 8
2008 9
2009 10
2010 13
2011 15
2012 14
2013 21
2014 22
2015 18
2016 12
2017 11
2018 5
2019 6
2020 10
2021 4
Text availability
Article attribute
Article type
Publication date

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251 results
Results by year
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251 results
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