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1968
1
1969
1
1970
2
1971
4
1972
2
1974
2
1975
1
1977
8
1979
1
1980
6
1981
1
1982
2
1983
2
1984
5
1985
2
1986
10
1987
5
1988
9
1989
2
1990
5