65% (1997)

80% (1999)

76% (1993)

72% (1996)

82% (1993)

72% (1995)

70% (1995)

45% (1993)

59% (1995)

62% (1998)

63% (1996)

70% (1995)

70% (1997)

71% (1995)

52% (2000)

60% (1997)

61% (1996)

60% (1996)

47% (2001)

56% (1991)