| 1971 12 | 1992 3 2000 1 | | | | | | | | 1989 . 01 1992 . 01 | | | 1992 . 01 1992 . 03 | 1992 . 03 1993 . 08 | | ( 1992 . 03 1992 . 05 | | ) | 1993 . 08 1997 . 01 | | ( 1993 8 1995 12 | | ) | 1997 . 01 2001 . 05 | | | 2001 . 05 2004 . 03 | | ( 1997 . 04 2001 . 12 | | ) | 2004 . 03 2006 . 03 | | | 2006 . 03 2007 . 04 | | | 2007 . 04 2010 . 08 | | | ( ) | 2010 . 08 2011 . 12 | | | | 2011 . 12 2016 . 01 | | | 2016 . 01 2020 . 10 | | | | 2020 . 10 2021 . 01 | | | | 2021 . 01 2021 . 03 | | | | | | 2021 . 03 | | | | | | | | | | | | | |