| | | | | | 1951 12 | 1981 | 8 1975 9 | | 1975 9 1980 1 | | | 1980 1 1985 4 | 511 | | 1985 4 1987 5 | 11 | | 1987 5 1993 5 | 11 | | 1993 5 1994 8 | 1 | | 1994 8 1998 12 | 1 | | 1998 12 2000 3 | | | | 2000 3 2012 1 | | | | 2012 1 | |