| | | 1971 5 | 1996 10 | 1991 8 | | | 1991 8 1995 7 | | 1995 7 1998 7 | | 1998 7 2001 10 | | 2001 10 2002 10 | | 2002 10 2005 10 | | | 2005 10 2009 4 | | 2009 4 2012 12 | | 2012 12 2015 4 | | 2015 4 2017 8 | | 2017 8 2019 3 | | 2019 3 2021 4 | | 2021 4 | |