10% (1992)

0% (1989)

68% (1993)

66% (1987)

0% (1988)

50% (1990)

62% (1989)

62% (1992)

55% (1991)

59% (1995)

59% (1994)

42% (1987)

20% (1996)

0% (1998)

35% (1992)

50% (1994)

38% (1990)

0% (1988)

75% (1990)

65% (1989)