77% (1971)

70% (1972)

77% (1970)

79% (1971)

74% (1961)

71% (1970)

65% (1974)

72% (1972)

66% (1972)

77% (1973)

60% (1971)

73% (1972)

63% (1971)

53% (1972)

62% (1969)

67% (1971)

64% (1973)

69% (1962)

70% (1973)

64% (1974)