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Year
1951
2
1961
2
1971
2
1981
2
1991
6
1999
1
2001
127
2002
2
2003
11
2004
11
2005
4
2006
11
2007
15
2008
22
2009
21
2010
3
2011
52
2012
149
2014
2
2015
2