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Year
1988
10
1989
10
1990
10
1991
18
1993
20
1994
14
1995
16
1996
14
1999
24
2000
14
2001
18
2002
10
2004
22
2005
12
2006
18
2007
14
2010
12
2011
20
2012
12
2013
10
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