84% (2005)

78% (1995)

77% (2003)

79% (1993)

76% (2001)

81% (1966)

84% (1987)

71% (1978)

77% (1993)

73% (1976)

78% (1985)

61% (1969)

76% (1982)

80% (1994)

54% (1991)

72% (1993)

75% (2005)

81% (2005)

67% (1967)

82% (1998)