78% (1971)

77% (1970)

77% (1973)

70% (1972)

67% (1971)

67% (1972)

73% (1961)

62% (1969)

53% (1972)

55% (1976)

71% (1970)

79% (1971)

59% (1971)

65% (1974)

73% (1972)

50% (1964)

72% (1972)

71% (1968)

61% (1973)

58% (1965)