73% (1989)

74% (1981)

66% (1987)

78% (1988)

78% (1985)

65% (1989)

70% (1988)

72% (1985)

65% (1983)

68% (1987)

61% (1986)

63% (1989)

52% (1986)

64% (1985)

58% (1986)

55% (1987)

42% (1988)

53% (1983)

66% (1985)

42% (1987)