68% (1967)

58% (1970)

47% (1965)

61% (1962)

37% (1969)

56% (1959)

54% (1970)

67% (1974)

80% (1970)

56% (1970)

59% (1958)

70% (1979)

61% (1967)

64% (1962)

53% (1968)

60% (1968)

60% (1965)

72% (1969)

38% (1987)

69% (1961)