77% (2003)

84% (2005)

55% (1991)

79% (1993)

80% (1966)

82% (1998)

60% (1983)

72% (1976)

84% (1987)

67% (1967)

77% (1993)

81% (2005)

78% (1995)

60% (1994)

78% (1985)

81% (2005)

76% (2001)

73% (1995)

75% (2005)

76% (1982)