76% (2003)

83% (2005)

76% (1982)

82% (1998)

84% (1987)

77% (1993)

81% (1966)

78% (1985)

78% (1995)

75% (2005)

81% (2005)

73% (1995)

79% (1993)

76% (2001)

77% (1966)

79% (1996)

81% (2005)

67% (1967)

73% (1982)

81% (2004)