71% (1993)

78% (1994)

77% (2003)

78% (1995)

84% (1987)

78% (1970)

79% (1993)

30% (1998)

84% (2005)

71% (1962)

74% (1995)

76% (2001)

82% (1998)

81% (2005)

77% (1993)

81% (1966)

76% (1966)

76% (1982)

79% (1996)

81% (2005)