60% (1962)

57% (1960)

67% (1971)

69% (1970)

52% (1960)

70% (1968)

68% (1977)

70% (1969)

74% (1963)

60% (1968)

54% (1967)

72% (1971)

50% (1960)

56% (1961)

54% (1966)

70% (1965)

53% (1974)

56% (1968)

45% (1969)

60% (1956)