76% (2003)

84% (2005)

74% (1995)

82% (1998)

84% (1987)

80% (1966)

78% (1995)

77% (1993)

81% (2005)

77% (1985)

76% (1982)

79% (1993)

75% (2005)

76% (2001)

79% (1996)

67% (1967)

72% (1993)

77% (1966)

58% (1988)

72% (1996)