| 1968 6 | | | 2001 6 1 | 1988 2 | | 1988 . 02 1991 . 06 | | 1991 . 06 2001 . 08 | | 2001 . 08 2003 . 08 | | | 2003 . 12 2005 . 02 | | | 2005 . 02 2010 . 08 | | | 2010 . 08 2012 . 10 | | | 2012 . 10 2015 . 11 | | 2015 . 11 2017 . 08 | | 2017 . 08 | | | | | ( | ) | | | | | | ( | | ) | | |