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1989
1
1990
to
1991
0
1992
to
1994
0
1995
to
1996
0
1997
to
1999
2
2000
to
2001
2
2002
to
2004
4
2005
to
2006
6
2007
to
2009
9
2010
to
2011
3
2012
to
2014
5
2015
2