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Results by year

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

Year Number of Results
1981 1
1983 3
1984 21
1985 79
1986 119
1987 168
1988 238
1989 325
1990 323
1991 395
1992 465
1993 371
1994 390
1995 338
1996 310
1997 331
1998 408
1999 335
2000 366
2001 378
2002 336
2003 355
2004 373
2005 385
2006 383
2007 395
2008 418
2009 411
2010 430
2011 420
2012 454
2013 507
2014 502
2015 481
2016 282
2017 263
2018 279
2019 133
2020 6
Text availability
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Article type
Publication date

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11,433 results
Results by year
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