1971
1981
1970
1968
1976
1970
1968
1972
1974
1975
1969
1986
1973
1984
1970
1966
1986
1972
1972
1982
1975
1982
1983
1984
1980
1973
1984
1977
1968
1985
1984
1980
1985
1987
1984
1969
1970
1983
1981
1977
1969
1984
1977
1978
1970
1978
1981
1984
1973
1979
1978
1969
1977
1980
1977
1976
1983
1976
1985
1969
1974
1979
1977
1975
1978
1975
1975
1975
1981
1974
1980
1974
1982
1985
1984
1978
1982
1981
1982
1978
1980
1979
1979
1979
1981
1982
1977
1971
1977
1973
1969
1985
1981
1981
1980
1981
1986
1976
1985
1986
1983
1972
1985
1982
1985
1983
1982
1982
1981
1981
1982
1982
1983
1984
1983
1968
1984
1982
1981
1983
1971
1987
1979
1979
1987
1985
1980
1980
1985
1984
1984
1980
1982
1980
1980
1981
1979
1979
1970
1970
1977
1982
1982
1982
1974
1974
1978
1978
1978
1978
1979
1978
1984
1986
1979
1985
Comments