70% (1982)

37% (1987)

20% (1988)

50% (1986)

45% (1986)

73% (1985)

50% (1984)

70% (1981)

20% (1986)

0% (1985)

0% (1994)

50% (1985)

0% (1987)

59% (1987)

0% (1990)

30% (1984)

0% (1990)

0% (1989)