30% (2006)

40% (2008)

10% (2006)

20% (2009)

10% (2005)

35% (2003)

50% (1997)

20% (2008)

27% (2006)

20% (2005)

0% (2007)

0% (2009)

0% (2006)

20% (2003)

30% (1998)

10% (2003)

25% (1997)

35% (2003)

67% (2006)

0% (2002)