| | | 1970 | 1997 12 | 1991 9 | | | 1991.09 1996.03 | | 1996.03 2000.06 | | 2000.06 2002.04 | | 2002.04 2003.02 | | 2003.02 2008.04 | | 2008.04 2009.03 | | 2009.03 2010.08 | | 2010.08 2014.02 | | 2014.02 2015.07 | | | 2005.07 2017.10 | | | 2017.10 2019.02 | | | | 2019.02 | | | | | | | | | | | | | | | | | | | | | | |