76% (2011)

66% (2013)

56% (2015)

71% (2013)

73% (2016)

68% (2014)

48% (2008)

73% (2005)

50% (2009)

57% (2007)

67% (2010)

65% (2014)

48% (2007)

55% (2011)

55% (2008)

52% (2007)