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Year
1968
10
1969
10
1970
8
1971
8
1972
10
1973
8
1974
8
1975
8
1976
8
1977
12
1979
14
1980
12
1981
10
1982
8
1983
8
1985
8
1986
16
1987
18
1989
12
1990
8
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