76% (2006)

62% (2000)

72% (2007)

68% (1999)

71% (2003)

37% (2004)

76% (2011)

66% (2009)

76% (2001)

75% (2006)

63% (2008)

51% (1996)

68% (2010)

66% (2002)

52% (2004)

66% (2009)

64% (2007)

65% (2004)

20% (2002)

54% (2001)