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1968
to
1969
10
1970
to
1971
13
1972
to
1974
7
1975
to
1976
12
1977
to
1979
2
1980
to
1981
0
1982
to
1984
0
1985
to
1986
0
1987
to
1989
3
1990
to
1991
0
1992
to
1992
1