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

Year Number of Results
1962 2
1967 1
1968 2
1969 3
1970 5
1971 1
1972 3
1973 2
1974 7
1975 11
1976 18
1977 24
1978 20
1979 16
1980 21
1981 20
1982 24
1983 41
1984 37
1985 31
1986 36
1987 33
1988 47
1989 116
1990 306
1991 388
1992 411
1993 522
1994 589
1995 612
1996 756
1997 881
1998 886
1999 1073
2000 861
2001 858
2002 1035
2003 1061
2004 1353
2005 1742
2006 2169
2007 2538
2008 2785
2009 3249
2010 3777
2011 3742
2012 4275
2013 4454
2014 4610
2015 4858
2016 4779
2017 4804
2018 4989
2019 3332
2020 221
Text availability
Article attribute
Article type
Publication date

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61,052 results
Results by year
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