60% (2012)

62% (2014)

57% (2010)

65% (2012)

56% (2009)

76% (2008)

66% (2009)

65% (2010)

68% (2009)

64% (2009)

71% (2006)

55% (2009)

50% (2010)

65% (2008)

62% (2014)

64% (2008)

59% (2014)

66% (2006)

64% (2012)

59% (2010)