77% (2003)

83% (2005)

84% (1987)

77% (1993)

71% (1993)

76% (1966)

79% (1993)

79% (1995)

60% (1969)

82% (1998)

77% (1985)

73% (1982)

73% (1995)

81% (2005)

76% (2001)

80% (1966)

79% (1996)

67% (1969)

75% (2005)

76% (1982)