10% (1990)

55% (1997)

30% (1993)

10% (1991)

28% (1999)

0% (1991)

24% (1994)

50% (1994)

50% (1989)

50% (1992)

47% (1999)

50% (1995)

25% (1993)

75% (1994)

32% (1998)

35% (2000)

50% (1993)