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1978
to
1979
2
1980
to
1981
0
1982
to
1983
0
1984
to
1985
4
1986
to
1987
2
1988
to
1989
1
1990
to
1991
0
1992
to
1993
0
1994
to
1995
0
1996
to
1997
1
1998
1