67% (2007)

70% (2007)

78% (2010)

76% (2011)

70% (2011)

62% (2012)

75% (2006)

72% (2009)

70% (2005)

64% (2011)

56% (2005)

65% (2011)

71% (2006)

66% (2009)

63% (2010)

71% (2005)

74% (2007)

74% (2011)

61% (2008)

63% (2006)