72% (1975)

67% (1965)

71% (1963)

75% (1963)

76% (1970)

77% (1964)

55% (1972)

61% (1973)

78% (1967)

68% (1974)

59% (1967)

58% (1965)

56% (1971)

63% (1967)

64% (1973)

73% (1964)

61% (1963)

55% (1971)

63% (1965)

50% (1974)