68% (2008)

64% (2015)

61% (2015)

50% (2013)

60% (2009)

58% (2011)

72% (2011)

77% (2015)

73% (2009)

70% (2013)

53% (2010)

62% (2015)

30% (2010)

71% (2014)

70% (2013)

75% (2014)

75% (2015)

65% (2013)

49% (2013)

42% (2015)