73% (1964)

71% (1963)

75% (1963)

73% (1975)

77% (1964)

75% (1970)

66% (1965)

59% (1967)

64% (1965)

55% (1972)

77% (1967)

58% (1965)

60% (1973)

55% (1971)

64% (1973)

68% (1974)

56% (1971)

61% (1963)

64% (1967)

61% (1970)