71% (1985)

67% (1986)

72% (1986)

70% (1990)

71% (1986)

52% (1991)

50% (1991)

67% (1988)

62% (1988)

69% (1989)

73% (1987)

48% (1984)

59% (1984)

65% (1984)

61% (1991)

65% (1987)

74% (1990)

60% (1986)

67% (1987)

0% (1988)