68% (1993)

80% (1986)

76% (2001)

83% (2011)

67% (1968)

80% (2002)

79% (2006)

75% (1997)

78% (1987)

83% (2009)

51% (1998)

69% (2009)

83% (2015)

75% (2017)

71% (2014)

75% (2007)

84% (1957)

75% (1999)

67% (1992)

76% (2016)