74% (2010)

76% (2009)

70% (2008)

72% (2012)

71% (2005)

69% (2006)

74% (2006)

70% (2004)

69% (2002)

71% (2004)

66% (2007)

62% (2007)

68% (2006)

69% (2014)

49% (1996)

72% (2009)

68% (2009)

66% (2011)

73% (2013)

66% (2009)