56% (2015)

76% (2011)

73% (2016)

65% (2014)

66% (2013)

67% (2010)

67% (2014)

73% (2005)

71% (2013)

50% (2009)

48% (2008)

48% (2007)

56% (2007)

54% (2011)

55% (2008)

52% (2007)