| 1981 11 | 2000 10 2004 5 | | | 1996.09 1999.07 | | 1999.07 2000.10 | 2000.10 2005.04 | 2002.07--2004.09 | | 2005.04 2006.05 | | 2006.05 2008.06 | | 2008.06 2011.04 | | 2011.04 2012.10 | | 2012.10 2016.05 | 2016.05 2020.01 | | 2020.01 2021.04 | | 2021.04 2021.06 | | 2021.06 | | | |