72% (1989)

75% (1981)

78% (1988)

78% (1985)

72% (1985)

65% (1983)

65% (1987)

65% (1989)

68% (1987)

52% (1986)

61% (1986)

70% (1988)

63% (1989)

55% (1987)

42% (1988)

66% (1985)

57% (1982)

64% (1985)

53% (1983)

58% (1986)