82% (1985)

82% (1979)

78% (1972)

80% (1975)

80% (1966)

75% (1966)

80% (1957)

79% (1962)

77% (1925)

75% (1965)

71% (1938)

79% (1976)

80% (1975)

78% (1969)

68% (1938)

76% (1980)

59% (1969)

69% (1967)

55% (1953)

61% (1936)