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Year
1951
2
1953
1
1961
2
1971
2
1981
2
1989
6
1991
2
1998
1
2000
1
2001
6
2002
1
2003
1
2004
1
2005
1
2006
1
2007
1
2008
4
2009
1
2010
6
2011
3