1971
1972
1994
1991
1989
1988
1972
1971
1972
1973
1972
1971
1972
1972
1986
1993
1992
1992
1990
1993
1990
1996
1994
1998
1994
1996
1966
1971
1978
1991
1991
1993
1981
1975
1977
1964
1973
1988
1984
1973
1978
1995
1971
2001
1972
1974
1997
1975
1972
1984
1983
1970
1991
1991
1985
1986
1983
1996
1970
1988
1991
1967
1987
1988
1995
1991
1966
2001
1979
1984
1978
1991
1991
1990
1989
1989
1989
1990
1990
1991
1997
1991
1991
1991
1990
1991
1995
1992
1992
1994
1990
1993
2001
1998
1993
1988
1990
1992
1965
1989
2000
Comments