77% (2003)

84% (2005)

77% (1993)

82% (1998)

78% (1985)

55% (1991)

81% (1966)

74% (1995)

81% (2005)

76% (1982)

84% (1987)

60% (1994)

79% (1993)

60% (1983)

78% (1995)

75% (2005)

72% (1976)

67% (1967)

78% (1996)

76% (2001)