73% (2004)

73% (2011)

60% (2008)

72% (2007)

72% (2013)

62% (2009)

62% (2008)

76% (2014)

61% (2014)

74% (2012)

65% (2011)

70% (2015)

66% (2006)

68% (2015)

70% (2011)

70% (2014)

71% (2010)

59% (2012)

74% (2009)

72% (2008)