71% (1963)

73% (1964)

75% (1963)

57% (1974)

77% (1964)

55% (1972)

75% (1970)

66% (1965)

75% (1976)

72% (1974)

77% (1967)

55% (1971)

78% (1960)

81% (1977)

58% (1965)

50% (1974)

61% (1962)

53% (1975)

64% (1973)

59% (1967)