63% (2008)

74% (2002)

66% (2005)

76% (2003)

70% (1996)

68% (2006)

76% (2001)

62% (2000)

69% (2001)

58% (2008)

53% (2006)

68% (2002)

62% (2005)

70% (2003)

56% (2004)

65% (1998)