76% (1985)

57% (1971)

62% (1971)

71% (1983)

57% (1972)

60% (1978)

53% (1971)

52% (1973)

63% (1971)

65% (1981)

54% (1969)

56% (1968)

50% (1979)

45% (1970)

55% (1982)

47% (1974)

58% (1971)

80% (1975)

57% (1982)

67% (1970)