74% (1985)

78% (1984)

37% (1987)

30% (1984)

0% (1994)

50% (1984)

60% (1986)

20% (1988)

70% (1982)

50% (1985)

70% (1981)

52% (1986)

0% (1990)

59% (1987)

0% (1987)

20% (1986)

0% (1990)

45% (1986)

0% (1989)

0% (1987)