82% (1979)

83% (1985)

76% (1965)

80% (1975)

78% (1972)

76% (1925)

79% (1967)

71% (1970)

73% (1974)

79% (1973)

79% (1969)

80% (1975)

79% (1964)

80% (1957)

80% (1966)

74% (1975)

80% (1959)

76% (1959)

79% (1962)

69% (1967)