76% (2006)

62% (2000)

71% (2003)

66% (2009)

72% (2007)

76% (2001)

68% (1999)

76% (2011)

37% (2004)

51% (1996)

75% (2006)

68% (2010)

66% (2002)

54% (2001)

63% (2008)

65% (2004)

66% (2009)

52% (2004)

61% (2007)

70% (1994)