72% (1966)

77% (1963)

52% (1978)

65% (1967)

33% (1961)

49% (1972)

48% (1975)

57% (1966)

45% (1978)

44% (1966)

60% (1973)

73% (1965)

43% (1963)

53% (1968)

60% (1966)

52% (1968)

59% (1963)

52% (1959)

40% (1972)

58% (1962)