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Year
1951
2
1961
2
1971
2
1981
2
1990
45
1991
6
1999
1
2000
18
2001
123
2002
2
2003
11
2004
11
2005
4
2006
11
2007
15
2008
22
2009
21
2010
2
2011
112
2012
14