73% (1989)

65% (1987)

78% (1988)

75% (1981)

78% (1985)

72% (1985)

68% (1987)

65% (1983)

65% (1989)

42% (1988)

61% (1986)

55% (1987)

58% (1986)

64% (1985)

66% (1985)

52% (1986)

63% (1989)

53% (1983)

70% (1988)

60% (1989)