10% (2011)

40% (2003)

20% (1996)

25% (2010)

20% (2002)

65% (2001)

20% (2009)

20% (2000)

30% (2008)

20% (1998)

20% (1999)

20% (2009)

20% (2002)

35% (2009)

0% (2001)

70% (1998)