84% (2005)

77% (2003)

84% (1987)

79% (1993)

78% (1995)

76% (2001)

77% (1993)

61% (1969)

81% (2005)

72% (1993)

75% (2005)

79% (1996)

76% (1982)

81% (1994)

67% (1967)

81% (1966)

77% (1985)

82% (1998)

73% (1982)

70% (1962)