73% (2004)

72% (2007)

64% (2011)

70% (2011)

72% (2013)

66% (2006)

61% (2014)

74% (2012)

73% (2011)

59% (2008)

62% (2009)

62% (2008)

64% (2007)

71% (2010)

70% (2014)

57% (2010)

69% (2008)

68% (2015)

70% (2015)

60% (2007)