74% (2010)

76% (2010)

66% (2012)

71% (2014)

71% (2015)

72% (2011)

74% (2012)

73% (2012)

71% (2007)

70% (2010)

72% (2013)

64% (2013)

74% (2006)

64% (2011)

67% (2007)

71% (2011)

73% (2010)

70% (2009)

62% (2007)

72% (2008)