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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
0
2002
to
2004
1
2005
to
2006
1
2007
to
2009
1
2010
to
2011
1
2012
1