68% (1998)

83% (1995)

63% (2003)

57% (1996)

64% (1994)

65% (1996)

67% (1994)

59% (1997)

57% (1993)

55% (1992)

62% (1998)

52% (1995)

70% (1993)

55% (1991)

43% (1992)

80% (1990)

0% (1993)

57% (1990)

67% (1995)

96% (1996)