59% (1976)

62% (1983)

58% (1967)

69% (2009)

75% (1967)

77% (1979)

72% (1976)

72% (1971)

57% (1980)

76% (1985)

67% (1965)

71% (1976)

77% (1974)

70% (1990)

56% (1989)

78% (1974)

72% (1975)

81% (1975)

67% (1973)

62% (2004)