76% (2003)

60% (1969)

83% (2005)

70% (1962)

69% (1990)

72% (1976)

84% (1987)

76% (1966)

68% (1969)

73% (1978)

71% (1996)

79% (1993)

71% (1993)

78% (1995)

77% (1993)

82% (1998)

71% (1994)

76% (2001)

79% (1996)

80% (1966)