78% (1988)

78% (1985)

74% (1981)

73% (1989)

69% (1987)

65% (1989)

65% (1983)

66% (1987)

73% (1985)

55% (1987)

64% (1985)

63% (1989)

42% (1988)

53% (1983)

59% (1986)

52% (1986)

50% (1984)

62% (1986)

70% (1988)

60% (1989)