1960, 1964, 1968, 1972, 1976, 1980, 1984, 1988, 1992, 1996, 2000, 2004, 2008, 2012, 2016
1976, 1980, 1984, 1988, 1992, 1994, 1998, 2002, 2006, 2010, 2014