82% (2016)

69% (2016)

70% (2011)

60% (2013)

69% (2012)

65% (2012)

62% (2013)

50% (2010)

62% (2013)

59% (2015)

49% (2016)

62% (2013)

58% (2013)

64% (2015)

57% (2012)

63% (2014)

63% (2015)

68% (2016)

60% (2010)

48% (2009)