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1978
to
1979
3
1980
to
1981
7
1982
to
1984
4
1985
to
1986
8
1987
to
1989
6
1990
to
1991
1
1992
to
1994
4
1995
to
1996
13
1997
to
1999
13
2000
to
2001
11
2002
to
2004
6
2005
2