28% (2000)

35% (1995)

30% (1992)

54% (1993)

13% (1995)

10% (1996)

32% (1994)

30% (1993)

36% (1994)

50% (2001)

22% (1997)

13% (1996)

14% (1997)

30% (2005)

10% (2003)

58% (1997)

10% (2005)

30% (1997)

30% (1998)

80% (2000)