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

Year Number of Results
1947 1
1959 4
1960 5
1961 8
1962 6
1967 1
1968 1
1973 1
1987 3
1988 55
1989 106
1990 150
1991 203
1992 281
1993 228
1994 165
1995 130
1996 109
1997 125
1998 141
1999 157
2000 168
2001 201
2002 249
2003 201
2004 444
2005 248
2006 327
2007 336
2008 367
2009 389
2010 481
2011 554
2012 417
2013 372
2014 347
2015 313
2016 288
2017 217
2018 214
2019 167
2020 15
Text availability
Article attribute
Article type
Publication date

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7,608 results
Results by year
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