30% (2010)

0% (1992)

53% (2003)

60% (1995)

50% (1999)

65% (2001)

30% (2006)

62% (2008)

51% (2005)

48% (2007)

63% (2009)

40% (2007)

0% (2008)

0% (2006)

30% (2008)

55% (1997)

35% (2005)

60% (2006)

62% (1999)

52% (2004)