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

Year Number of Results
1989 1
1991 1
1998 1
2001 1
2002 2
2003 2
2004 9
2005 12
2006 7
2007 11
2008 15
2009 18
2010 28
2011 36
2012 34
2013 59
2014 124
2015 164
2016 180
2017 236
2018 299
2019 388
2020 449
2021 152
Text availability
Article attribute
Article type
Publication date

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1,962 results
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