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Year
1981
39
2007
33
2008
23
2009
16
1961
13
1971
13
2011
13
2006
11
1997
6
2004
6
2005
6
2012
5
1940
4
2000
4
2013
4
1984
2
1994
2
1998
2
2001
2
2003
2