30% (2001)

46% (1996)

54% (1990)

0% (2000)

40% (2001)

52% (1992)

20% (1998)

29% (1989)

29% (2003)

49% (1994)

52% (2002)

22% (2006)

13% (1997)

0% (1996)

14% (1994)