83% (2009)

82% (2012)

71% (2014)

78% (2015)

67% (2008)

75% (2006)

66% (2008)

77% (2007)

81% (2016)

72% (2016)

65% (2017)

63% (2008)

68% (2007)

80% (2007)

78% (2010)

64% (2006)

75% (2008)

66% (2016)

71% (2012)

61% (2016)