55% (2010)

0% (2008)

0% (1996)

10% (1999)

35% (2002)

0% (2008)

0% (2005)

55% (2010)

0% (2010)

57% (2009)

40% (2006)

0% (2009)

15% (2010)

0% (1997)

0% (2011)

0% (1987)

0% (2004)

60% (2001)

80% (2009)

0% (1993)