73% (2010)

76% (2009)

68% (1992)

71% (2004)

70% (2008)

70% (2006)

71% (2005)

74% (2006)

69% (2002)

70% (2004)

62% (2007)

72% (2012)

69% (2014)

72% (2009)

62% (2009)

49% (1996)

64% (2009)

69% (2008)

72% (2013)

68% (2009)