77% (2003)

84% (2005)

84% (1987)

78% (1995)

77% (1993)

79% (1993)

76% (1982)

81% (1966)

81% (2005)

78% (1985)

75% (2005)

76% (2001)

73% (1982)

67% (1967)

79% (1996)

82% (1998)

70% (1962)

56% (1988)

72% (1993)

78% (1970)