| | 1968 10 | | 1990 7 1994 10 | | | | | 1990 7 1997 4 | | 1997 4 1998 12 | | | | 1998 12 2000 1 | | | | 2000 1 2007 12 | | | | 2007 12 2010 1 | | | 2010 1 2012 2 | | | | 2012 2 2013 4 | | | 2013 4 2016 7 | | | | 2016 7 | | | | | | | | | |