82% (2012)

70% (2011)

68% (2009)

76% (2011)

78% (2010)

81% (2006)

65% (2010)

69% (2010)

70% (2008)

62% (2009)

70% (2012)

67% (2010)

63% (2013)

70% (2008)

76% (2005)

74% (2007)

67% (2014)

77% (2007)

71% (1999)

60% (2006)