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Year
1947
1
1951
4
1961
4
1971
4
1981
4
1986
1
1990
9
1991
8
1999
1
2000
2
2001
111
2002
2
2003
11
2004
12
2005
4
2006
16
2007
19
2008
24
2009
23
2010
4