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Results by year

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

Year Number of Results
1987 3
1988 2
1989 10
1990 13
1991 26
1992 33
1993 47
1994 82
1995 147
1996 250
1997 219
1998 191
1999 242
2000 287
2001 358
2002 409
2003 421
2004 510
2005 523
2006 509
2007 505
2008 578
2009 590
2010 586
2011 573
2012 574
2013 565
2014 525
2015 476
2016 463
2017 412
2018 365
2019 151
2020 2
Text availability
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Article type
Publication date

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9,562 results
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