1968
1973
1987
1983
1969
1976
1966
1982
1981
1991
1983
1993
1972
1988
1988
1980
1973
1974
1990
1987
1982
1964
1969
1976
1967
1964
1985
1991
1967
1968
1990
1970
1984
1975
1975
1969
1970
1988
1971
1977
1981
1982
1983
1984
1979
1977
1977
1971
1975
1985
1984
1985
1990
1983
1985
1984
1969
1970
1973
1973
1984
1984
1992
1991
1990
1987
1987
1980
1987
1984
1984
1989
1989
1983
1978
1974
1987
1985
Comments