83% (1985)

81% (1979)

80% (1975)

78% (1962)

76% (1925)

78% (1972)

80% (1966)

72% (1970)

77% (1965)

78% (1969)

80% (1975)

79% (1957)

80% (1973)

79% (1967)

61% (1969)

76% (1980)

77% (1977)

73% (1944)

69% (1967)

80% (1977)