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

Year Number of Results
1977 1
1978 1
1984 1
1986 1
1987 4
1988 3
1989 2
1990 1
1991 1
1992 2
1993 1
1994 1
1995 3
1997 2
1998 3
1999 1
2000 4
2001 2
2002 7
2003 5
2004 10
2005 2
2006 5
2007 7
2008 11
2009 10
2010 10
2011 6
2012 12
2013 7
2014 12
2015 4
2016 13
2017 11
2018 16
2019 12
2020 7
2021 5
Text availability
Article attribute
Article type
Publication date

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184 results
Results by year
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184 results
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