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Year
1951
4
1961
4
1971
4
1981
4
1986
1
1991
8
1999
1
2000
2
2001
53
2004
3
2006
12
2007
1
2009
4
2010
2
2011
107
2012
1
2014
50
2015
2
2016
2
2017
2