77% (2003)

83% (2005)

84% (1987)

79% (1993)

78% (1995)

72% (1993)

79% (1996)

81% (2005)

77% (1993)

82% (1998)

78% (1985)

77% (1966)

71% (1962)

73% (1982)

76% (2001)

75% (2005)

81% (1966)

79% (1994)

54% (1991)

60% (1969)