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Results by year

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

Year Number of Results
1972 1
1988 1
1989 4
1990 1
1999 1
2000 3
2001 1
2002 3
2003 1
2004 3
2005 7
2006 4
2007 8
2008 5
2009 9
2010 18
2011 13
2012 11
2013 21
2014 26
2015 30
2016 21
2017 24
2018 20
2019 27
2020 4
Text availability
Article attribute
Article type
Publication date

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227 results
Results by year
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