64% (2009)

79% (2013)

78% (2010)

78% (2012)

72% (2008)

61% (2010)

71% (2015)

71% (2009)

73% (2011)

75% (2012)

79% (2013)

74% (2010)

73% (2014)

72% (2010)

70% (2010)

64% (2011)

62% (2007)

67% (2011)

70% (2014)

70% (2012)