| | | | 1956 | | 1964 3 1974 7 | | 1976 7 1977 3 | | 1977 | 1977 3 1979 7 | 1979 7 1986 6 | | 1986 6 | 1988 5 | | 1989 10 1996 8 | | 1996 8 | 1999 5 | 2016 7 |