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1977
to
1979
2
1980
to
1981
3
1982
to
1984
0
1985
to
1986
0
1987
to
1989
0
1990
to
1991
0
1992
to
1994
2
1995
to
1996
2
1997
to
1999
7
2000
to
2001
2