65% (2009)

78% (2010)

78% (2012)

72% (2008)

79% (2013)

64% (2011)

72% (2010)

74% (2012)

72% (2015)

62% (2007)

73% (2011)

71% (2010)

67% (2011)

72% (2009)

71% (2009)

62% (2010)

74% (2010)

80% (2013)

49% (2008)

59% (2008)