70% (1986)

50% (1998)

70% (1986)

90% (1990)

80% (1997)

78% (1996)

89% (1986)

70% (1989)

70% (1987)

0% (1985)

0% (1991)

70% (1988)

70% (1987)

70% (1987)

0% (1986)