| 1970 10 | 1996 12 | 1991 7 | | | 1988.09 - 1991.07 | 1991.07 - 1991.12 | | 1991.12 - 1998.01 | 1996.12 1994.08 - 1986.12 | | | 1998.01 - 2001.10 | | 2001.10 - 2003.10 | | 2003.10 - 2006.02 | | 2006.02 - 2008.10 | | 2008.10 - 2011.04 | | | 2011.04 - 2013.04 | | 2013.04 - 2014.12 | | 2014.12 - 2016.09 | | 2016.09 - 2016.10 | | 2016.10 - 2017.09 | | | 2017.09 - 2021.08 | | 2021.08 | | |