| | | 1970 | | 1998 6 | 1991 7 | | 1991.01 2001.10 | | 2001.10 2003.02 | | 2003.02 2006.10 | | 2006.10 2009.03 | | 2009.03 2010.07 | | 2010.07 2012.12 | | 2012.12 2016.08 | | 2016.08 2017.10 | | 2017.10 2018.08 | 2018.08 | | | | | | |