73% (2004)

72% (2013)

72% (2007)

64% (2011)

62% (2009)

59% (2008)

62% (2008)

66% (2006)

61% (2014)

70% (2015)

72% (2010)

76% (2014)

73% (2011)

74% (2012)

74% (2009)

70% (2011)

70% (2014)

61% (2007)

72% (2008)

56% (2010)