68% (1974)

75% (1978)

65% (1992)

77% (1990)

62% (2004)

62% (1963)

57% (1994)

65% (1967)

63% (1952)

78% (1951)

61% (1994)

64% (2003)

72% (2008)

68% (1974)

69% (2017)

76% (1971)

58% (1988)

56% (2004)

71% (1965)

72% (1963)