83% (1985)

81% (1979)

80% (1975)

78% (1972)

80% (1966)

77% (1925)

79% (1962)

80% (1957)

66% (1981)

75% (1965)

72% (1970)

80% (1975)

69% (1967)

77% (1980)

78% (1969)

75% (1970)

73% (1944)

71% (1966)

76% (1968)

78% (1977)