74% (1999)

75% (1999)

72% (1984)

72% (1997)

71% (2000)

59% (1983)

0% (1981)

52% (1986)

0% (1987)

0% (1989)

0% (1988)

0% (1992)

0% (1985)

0% (1980)

0% (1988)

70% (1986)

70% (1981)

70% (1980)

90% (1992)

0% (1989)