55% (2010)

0% (1996)

40% (2006)

55% (2010)

10% (1999)

0% (2010)

0% (2008)

0% (2011)

0% (2007)

0% (2009)

0% (2004)

0% (1992)

0% (2005)

0% (2004)

0% (2008)

0% (1997)

0% (1987)

0% (1993)

60% (2002)

80% (2009)