30 1978, 1988, 1991 1981, 1988 1969, 1980, 1995, 1997, 2003 1980, 1984, 1988, 1998 1982, 1991 1981, 1990, 1994 1978, 1981, 1984, 1988 1992, 1999, 2000 1997 1974, 1993, 1994 15 1993, 1997—1999 1980, 1984, 1989, 1998, 1999 1975 1974 1970, 1975 1971 1973 