76% (2001)

68% (1993)

83% (2011)

79% (2002)

77% (1987)

67% (1968)

79% (2006)

67% (1992)

75% (1999)

80% (1986)

74% (1997)

69% (2009)

76% (1984)

82% (2009)

72% (2002)

75% (2007)

51% (1998)

83% (2015)

69% (1985)

84% (1957)