66% (1985)

62% (1987)

81% (1992)

69% (1985)

65% (1984)

43% (1987)

74% (1975)

58% (1977)

47% (1981)

50% (1975)

64% (1976)

70% (1989)

48% (1987)

69% (1982)

60% (1992)

57% (1982)

72% (1989)

70% (1975)

71% (1989)

68% (1981)