72% (2011)

70% (2009)

68% (2008)

68% (2011)

73% (2012)

70% (2017)

65% (2012)

60% (2011)

58% (2011)

77% (2007)

56% (2009)

59% (2010)

57% (2011)

66% (2011)

63% (2008)

59% (2013)

66% (2008)

67% (2013)

67% (2008)

73% (2009)