| | | 1981 11 | | 2007 6 1999 | 3 | | | | 1999.03 2000.07 | | 2000.07 2002.05 | | 2002.05 2007.10 | | | 2007.10 2009.02 | | | 2009.02 2013.03 | | 2013.03 2015.05 | | 2015.05 2020.04 | | | 2020.04 2020.06 | | 2020.06 | | |