1967 1968 1968 1968 1968 1970 1972 1973 1974 1974 1974 1975 1975 1975 1975 1976 1976 1976 1977 1978 1979 1979 1979 1980 1980 1980 1982 1984 1984—1987 1985 1986 1987 1987 1988 1988 1988 1989 1989 1990 1990 1990 1991 1991 1992 1992 1993 1995 1998 1999 2002 2008 2018 