71% (1971)

76% (1964)

75% (1957)

60% (1969)

71% (1965)

74% (1962)

80% (1961)

81% (1958)

70% (1971)

62% (1976)

70% (1974)

60% (1965)

63% (1973)

72% (1983)

56% (1971)

69% (1959)

75% (1963)

70% (1965)

70% (1960)

71% (1979)