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1980
to
1981
1
1982
to
1984
2
1985
to
1986
0
1987
to
1989
1
1990
to
1991
1
1992
to
1994
2
1995
to
1996
1
1997
to
1999
2
2000
to
2001
1
2002
to
2004
0
2005
to
2006
0
2007
to
2008
2