| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 1991 . 09 1995 . 07 | | 1995 . 07 1997 . 05 | | | 1997 . 05 2002 . 10 | | 2002 . 10 2005 . 03 | | 2005 . 03 2006 . 01 | | 2006 . 01 - 2006 . 06 | | 2006 . 06 2007 . 11 | | 2007 . 11 2011 . 05 | | 2011 . 05 2018 . 05 | | | 2018 . 05 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |