77% (1964)

73% (1964)

71% (1963)

67% (1965)

75% (1963)

73% (1975)

54% (1974)

75% (1970)

55% (1972)

78% (1967)

42% (1975)

55% (1971)

64% (1965)

52% (1975)

61% (1973)

50% (1974)

67% (1967)

63% (1967)

58% (1967)

64% (1973)