67% (1968)

70% (1967)

58% (1964)

69% (1967)

64% (1969)

64% (1968)

66% (1964)

58% (1967)

63% (1966)

65% (1964)

63% (1964)

52% (1962)

62% (1966)

30% (1971)

64% (1966)

64% (1965)

62% (1963)

70% (1965)

48% (1967)

54% (1967)