72% (1966)

77% (1963)

48% (1975)

58% (1966)

65% (1967)

44% (1966)

46% (1975)

53% (1968)

60% (1973)

52% (1978)

33% (1961)

50% (1962)

73% (1965)

58% (1962)

60% (1966)

40% (1972)

45% (1978)

50% (1968)

49% (1972)

59% (1963)