77% (2003)

84% (2005)

78% (1995)

76% (1982)

81% (2005)

81% (1966)

82% (1998)

84% (1987)

77% (1993)

73% (1995)

79% (1993)

75% (2005)

76% (2001)

78% (1985)

58% (1988)

72% (1978)

79% (1996)

81% (2005)

81% (2004)

73% (1982)