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1960
1
1962
1
1965
1
1966
2
1968
14
1969
1
1970
9
1971
2
1977
1
1981
2
1984
1
1985
2
1986
1
1987
2
1988
2
1989
2
1991
4
1992
11
1993
2
1994
6