80% (1993)

68% (1992)

86% (1992)

64% (1996)

71% (1993)

63% (1990)

80% (1990)

78% (1990)

65% (1996)

83% (1994)

95% (1994)

74% (1998)

69% (1990)

79% (1995)

82% (1992)

79% (1998)

73% (1994)

55% (1993)

71% (1991)

68% (1994)