59% (1972)

52% (1969)

57% (1974)

66% (1972)

58% (1970)

68% (1976)

70% (1967)

78% (1963)

60% (1972)

64% (1959)

56% (1979)

64% (1976)

20% (1971)

55% (1965)

10% (1980)

53% (1956)

80% (1954)

0% (1961)

40% (1970)

69% (1961)