76% (1985)

62% (1971)

57% (1971)

71% (1983)

57% (1972)

63% (1971)

60% (1978)

65% (1981)

53% (1971)

80% (1975)

52% (1973)

50% (1979)

51% (1971)

48% (1970)

57% (1982)

55% (1982)

45% (1970)

67% (1970)

47% (1974)

66% (1968)