73% (1989)

74% (1981)

78% (1988)

69% (1987)

65% (1983)

65% (1989)

72% (1985)

65% (1987)

78% (1985)

63% (1989)

61% (1986)

64% (1985)

52% (1986)

70% (1988)

66% (1985)

42% (1988)

55% (1987)

59% (1986)

53% (1983)

58% (1982)