| 1960 10 | 1991 9 | 1981 8 | | 1979 9 1981 7 | | | 1981 8 1985 8 | | 1985 8 1990 3 | | 1990 3 1996 7 | | 1996 7 1997 5 | | 1997 5 1997 12 | | 1997 12 1999 1 | | 1999 1 2001 2 | | 2001 2 2008 1 | | 2008 1 2009 12 | | 2009 12 | | |