| | | 1971 | | 1999 12 | 1993 12 | | 1993.12 2009.05 | | 2009.05 2011.12 | | 2011.12 2015.11 | | | 2015.11 2016.09 | | 2016.09 2017.09 | | 2017.09 2018.07 | | 2018.07 2020.01 | | | 2020.01 2020.04 | | | 2020.04 | | | | | | | | | | |