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