70% (1987)

69% (1988)

30% (1986)

75% (1985)

66% (1988)

58% (1991)

78% (1987)

57% (1990)

73% (1991)

40% (1989)

68% (1990)

80% (1990)

70% (1987)

60% (1990)

50% (1987)

62% (1984)

60% (1988)

27% (1989)

0% (1991)

0% (1986)