| | | | | | | 1987.09 ︱ 1989.07 | ᠃ | 1989.07 ︱ 1990.07 26 | | 1990.07 ︱ 1992.03 26 | | 1992.03 ︱ 1993.12 26 | | 1993.12 ︱ 1996.03 26 | 1993. | 09 ︱ 1995.07 | | | 1996.03 ︱ 1996.08 | 1996.08 ︱ 1997.08 | | | 1997.08 ︱ 1998.12 | | | 1998.12 ︱ 2002.04 | | 1997.08 ︱ 1999.12 | | | 2002.04 ︱ 2007.08 | | | 2007.08 ︱ 2012.08 | | | 2012.08 ︱ 2016.11 | | | 2016.11 ︱ 2018.07 | | | 2018.07 ︱ 2019.06 | | | 2019.06 ︱ 2023.04 | | | 2023.04 ︱ 2023.06 | | 2023.06 ︱ 2023.07 | | | 2023.07 ︱ | |