74% (2004)

73% (2011)

61% (2008)

73% (2013)

62% (2008)

72% (2007)

64% (2011)

62% (2009)

70% (2015)

73% (2010)

66% (2006)

69% (2014)

70% (2011)

74% (2009)

74% (2012)

61% (2014)

76% (2014)

59% (2012)

65% (2010)

59% (2012)