69% (1962)

78% (1971)

77% (1970)

70% (1972)

78% (1973)

66% (1972)

67% (1971)

73% (1961)

72% (1970)

59% (1965)

63% (1965)

65% (1974)

58% (1968)

61% (1973)

72% (1972)

56% (1965)

62% (1969)

69% (1973)

73% (1972)

53% (1972)