73% (1989)

78% (1988)

73% (1985)

78% (1985)

65% (1983)

65% (1989)

66% (1987)

69% (1987)

55% (1987)

52% (1986)

70% (1988)

61% (1986)

64% (1985)

64% (1989)

58% (1986)

42% (1988)

65% (1985)

52% (1985)

53% (1983)

44% (1989)