71% (1985)

67% (1986)

72% (1986)

70% (1990)

67% (1988)

71% (1986)

69% (1989)

52% (1991)

59% (1984)

73% (1987)

66% (1987)

50% (1991)

62% (1988)

67% (1987)

48% (1984)

70% (1986)

74% (1990)

65% (1988)

60% (1986)

60% (1985)