68% (1973)

67% (1997)

60% (1957)

66% (2012)

45% (1963)

70% (1996)

65% (1966)

71% (2002)

68% (2010)

67% (1966)

77% (2000)

58% (1977)

60% (1952)

64% (2012)

35% (1951)

77% (1988)

66% (2017)

72% (1997)

72% (1972)

37% (1969)