55% (1993)

78% (1990)

80% (1990)

65% (1996)

76% (1998)

78% (1999)

80% (1999)

77% (1997)

68% (1997)

80% (1998)

74% (1998)

60% (1999)

76% (1999)

70% (1998)

71% (1999)

55% (1996)

72% (1990)

10% (2001)

60% (1994)

73% (1998)