| | | | | | | 1970 10 | 1991 10 1997 6 | | | | 1989.09 1991.07 | | 1991.07 1991.10 | 1991.10 1993.11 | 1993.11 1996.12 | 1996.12 1999.10 | 1999.10 2002.10 | 2002.10 2009.01 | 2009.01 2011.04 | | 2011.04 2015.11 | 2015. 11 2018.02 | | 2018.02 2018.04 | | 2018.04 2020.01 | | 2020.01 2021.06 | | | | 2021.06 2021.07 | | 2021.07 | | |