70% (1996)

52% (1998)

82% (1992)

78% (1998)

78% (1999)

64% (1999)

55% (1993)

76% (1995)

65% (1997)

78% (1994)

58% (1997)

60% (1992)

77% (1996)

71% (1985)

100% (1997)

90% (1998)

90% (1970)

0% (1995)

0% (1990)

70% (1994)