| | | | | | 1972 2 | | 1990 10 1994 6 | | 1990 10 1991 1 | | 1991 1 2003 6 | ; | 2003 6 2006 4 | | | 2006 4 2009 9 | | | 2009 9 2012 12 | | | 2012 12 2014 12 | | | 2014 12 2017 10 | | | 2017 10 | | | | |