| | | | | 1956 8 | 1974 8 | 1976 3 | 1974 8 1976 11 | | 1976 11 1978 3 | | 1978 3 1982 1 | | 1982 1 1985 1 | | | 1985 1 1991 5 | | | 1991 5 1995 8 | | | 1995 8 1996 5 | | | 1996 5 1998 2 | | 1998 2 2000 10 | | 2000 10 2003 1 | | | 2003 1 2004 12 | ; | 2004 12 2010 9 | ; | 2010 9 2011 8 | | 2011 8 2012 12 | ; | 2012 12 2013 6 | | | ; | 2013 6 2016 11 | | | 2016 11 2017 2 | | | 2017 2 2017 12 | | 2017 12 | |