73% (1989)

55% (1987)

78% (1985)

78% (1988)

65% (1989)

65% (1987)

65% (1983)

73% (1985)

74% (1981)

69% (1987)

52% (1986)

64% (1985)

64% (1989)

70% (1988)

61% (1986)

66% (1985)

42% (1988)

58% (1986)

53% (1983)

42% (1987)