1960 1961 1961 1965 1966–1968 1967 1968–1969 1968–1969 1968–1969 1969 1969–1970 1970 1972–1973 1973 1973–1975 1974 1974 1975 1976 1977 1977–1979 1978–1979 1978–1979 1979 1985 1986–1987 1989 1992 1993 1994 1996 1997 1997 1997 1998 1999 2006 