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Year
1970
8
1971
8
1972
8
1973
16
1975
8
1976
10
1977
10
1978
8
1979
14
1980
10
1981
8
1982
20
1983
28
1984
8
1986
8
1987
10
1988
22
1991
16
1992
12
1993
20
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