73% (1989)

78% (1988)

73% (1985)

78% (1985)

65% (1983)

65% (1989)

69% (1987)

66% (1987)

55% (1987)

52% (1986)

61% (1986)

63% (1985)

70% (1988)

42% (1988)

64% (1989)

66% (1985)

58% (1986)

53% (1983)

50% (1984)

59% (1982)