83% (1988)

55% (1991)

38% (1990)

50% (1990)

51% (1993)

70% (1994)

0% (1993)

66% (1992)

54% (1988)

10% (1989)

68% (1993)

53% (1987)

0% (1997)

50% (1999)

74% (1988)

0% (1987)

10% (1992)

10% (1990)

83% (1989)

64% (1989)