77% (1971)

76% (1970)

62% (1969)

61% (1973)

70% (1972)

73% (1961)

62% (1969)

70% (1962)

78% (1973)

72% (1970)

67% (1974)

67% (1971)

71% (1968)

66% (1972)

55% (1976)

58% (1968)

73% (1972)

53% (1972)

72% (1972)

64% (1960)