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

Year Number of Results
1981 27
1982 32
1983 35
1984 54
1985 43
1986 52
1987 48
1988 38
1989 49
1990 50
1991 49
1992 43
1993 47
1994 37
1995 46
1996 41
1997 42
1998 37
1999 35
2000 40
2001 72
2002 108
2003 173
2004 187
2005 292
2006 298
2007 306
2008 398
2009 639
2010 611
2011 894
2012 987
2013 650
2014 426
2015 354
2016 290
2017 348
2018 387
2019 338
2020 82
Text availability
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Article type
Publication date

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5,834 results
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