73% (1975)

71% (1963)

77% (1964)

75% (1963)

67% (1965)

76% (1970)

55% (1972)

63% (1967)

63% (1965)

56% (1971)

60% (1973)

58% (1965)

78% (1967)

68% (1974)

55% (1971)

64% (1973)

59% (1967)

73% (1964)

53% (1975)

50% (1974)