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Results by year

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

Year Number of Results
1957 1
1959 3
1961 2
1962 1
1963 2
1964 1
1969 3
1971 1
1980 1
1981 2
1987 1
1988 2
1989 5
1990 3
1991 3
1992 2
1993 5
1994 4
1995 1
1996 2
1997 7
1998 3
1999 5
2000 6
2001 7
2002 5
2003 4
2004 7
2005 10
2006 9
2007 16
2008 15
2009 8
2010 13
2011 6
2012 7
2013 15
2014 11
2015 16
2016 20
2017 9
2018 9
2019 20
2020 1
Text availability
Article attribute
Article type
Publication date

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249 results
Results by year
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