66% (1968)

60% (1974)

56% (1965)

72% (1971)

69% (1963)

65% (1960)

78% (1968)

74% (1950)

77% (1970)

52% (1972)

60% (1958)

50% (1963)

67% (1966)

60% (1960)

55% (1965)

61% (1962)

33% (1965)

74% (1970)

54% (1960)

50% (1973)