| | | | | 1956 7 | 1975 | 1984 9 | 1975 1 1978 10 | | | 1978 10 1981 7 | | | 1981 7 1984 3 | | 1984 3 1985 9 | | 1985 9 1988 10 | | ; | 1988 10 1992 5 | | | 1992 5 1994 8 | | 1994 8 1998 8 | | 1998 8 2003 10 | | 2003 10 2006 10 | | 2006 10 2006 11 | | | 2006 11 2016 10 | | | 2016 10 | |