| | | | | | | | | 1968 2 | 1991 9 | 1997 4 | | 1991 9 1996 12 | | 1996 12 1998 3 | | | 1998 3 1999 4 | | | 1999 4 1999 9 | | | 1999 9 2002 10 | | | 2002 10 2003 12 | | | 2003 12 2007 11 | | | 2007 11 2009 8 | | | | 2009 8 | | | | | |