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Year
1951
4
1961
4
1971
4
1981
4
1986
1
1991
8
1999
1
2000
2
2001
167
2002
2
2003
11
2004
12
2005
4
2006
23
2007
22
2008
22
2009
23
2010
4
2011
115
2012
150