73% (2004)

73% (2011)

62% (2008)

61% (2008)

72% (2007)

62% (2009)

73% (2013)

76% (2014)

56% (2010)

64% (2011)

65% (2006)

62% (2014)

70% (2015)

74% (2012)

68% (2015)

69% (2008)

70% (2014)

70% (2011)

65% (2010)

69% (2009)