| | | | | | 1968 9 | 1991 7 | 1986 7 | | 1986.07 1989.09 | | 1989.09 1991.07 | | 1991.07 1993.12 | | 1993.12 1997.05 1996.06 | | 1997.05 2011.04 | | | 2011.04 2012.11 | | 2012.11 2018.12 | | 2018.12 2021.07 | | 2021.07 2022.01 | | 2022.01 | | | |