| | | 1968 5 | | 1991 7 | 1997 5 | | | 1987 9 1991 7 | | 1991 7 1996 4 | | 1996 4 1997 9 | | 1997 9 1999 1 | | | 1999 1 2001 2 | | | 2001 2 2009 3 | | 2009 3 2012 4 | | 2012 4 2016 3 | | 2016 3 2019 5 | | | 2019 5 2019 12 | | | 2019 12 | | | | | | |