71% (2014)

66% (2012)

71% (2015)

76% (2010)

73% (2010)

74% (2012)

67% (2007)

71% (2007)

71% (2011)

73% (2011)

70% (2010)

76% (2013)

73% (2012)

63% (2010)

70% (2007)

58% (2011)

71% (2010)

60% (2007)

72% (2008)

59% (2009)