| | | | | | | | | | | | 1968 7 | 1993 2 1987 5 | | | | 1987.05 — 2002.06 | | 1989.9 — 1991.07 | 1994.8 ︱ 1996.12 | | 2002.06 ︱ 2006.12 | | 2006.12 ︱ 2009.04 | | 2009.04 ︱ 2011.01 | | 2011.01 ︱ 2012.12 | | 2012.12 ︱ 2017. 10 | | 2017.01 ︱2019.01 | | | 2019.01 ︱2021.6 | | 2021.06 ︱2022.01 | | 2021 10 | | 2022.01— | | | |