78% (2012)

64% (2009)

72% (2008)

79% (2013)

61% (2010)

80% (2013)

78% (2010)

64% (2011)

71% (2009)

74% (2012)

71% (2010)

71% (2015)

62% (2007)

72% (2009)

73% (2011)

58% (2009)

66% (2013)

71% (2010)

67% (2011)

62% (2010)