82% (2004)

80% (1999)

84% (2008)

77% (2008)

79% (2015)

86% (2013)

77% (2000)

76% (1997)

69% (2010)

77% (1957)

76% (2009)

81% (1971)

79% (2006)

69% (2005)

76% (1966)

80% (2010)

69% (2005)

77% (2013)

83% (1997)

85% (2017)