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

Year Number of Results
1976 1
1980 1
1985 1
1987 11
1988 24
1989 21
1990 20
1991 19
1992 28
1993 28
1994 33
1995 23
1996 18
1997 46
1998 24
1999 22
2000 46
2001 37
2002 40
2003 48
2004 55
2005 48
2006 56
2007 48
2008 56
2009 47
2010 73
2011 57
2012 75
2013 88
2014 115
2015 159
2016 185
2017 174
2018 176
2019 167
2020 90
Text availability
Article attribute
Article type
Publication date

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