73% (1975)

75% (1963)

71% (1963)

77% (1964)

76% (1970)

78% (1967)

60% (1973)

55% (1972)

67% (1965)

56% (1971)

59% (1967)

63% (1965)

73% (1964)

68% (1974)

64% (1973)

63% (1967)

53% (1975)

58% (1965)

61% (1963)

55% (1971)