73% (2004)

72% (2013)

60% (2008)

70% (2014)

72% (2007)

71% (2010)

62% (2008)

73% (2011)

64% (2011)

63% (2006)

61% (2014)

59% (2012)

74% (2012)

76% (2014)

62% (2009)

70% (2015)

66% (2006)

74% (2009)

72% (2008)

69% (2009)