| 1968 10 | 1987 8 | 1989 12 | | | | | | | 1987.08 1992.04 | | 1992.04 1996.10 | | 1996.10 1999.11 | | 1999.11 2001.09 | | 2001.09 2007.12 | | | 2007.12 2015.12 | | 2015.12 2019.01 | | 2019.01 2019.03 | | 2019.03 2020.08 | | 2020.08 2021.07 | | | 2021.07 2021.08 | | | | | | | 2021.08 2022.01 | | | | | | | 2022.01 | |