73% (2004)

72% (2007)

60% (2008)

74% (2012)

62% (2008)

70% (2015)

72% (2013)

62% (2009)

61% (2014)

68% (2015)

73% (2011)

64% (2011)

71% (2010)

70% (2014)

66% (2006)

61% (2007)

70% (2011)

59% (2012)

72% (2008)

56% (2007)