| | | 1961 8 | | 1981 8 1985 7 | | | 1979 7 1981 7 | | 1981 8 1984 2 | | 1984 2 1988 11 | | | 1988 11 1989 11 | | 1989 11 1991 12 | | 1991 12 1996 3 | | 1996 3 1998 11 | | | 1998 11 2000 11 | | 2000 11 2001 12 | | | 2001 12 2003 12 | | 2003 12 2006 6 | | | 2006 6 2009 5 | | | 2009 5 2010 4 | | 2010 4 2012 11 | | | 2012 11 | |