74% (1982)

75% (1983)

46% (1985)

59% (1987)

63% (1980)

37% (1986)

69% (1981)

0% (1978)

45% (1982)

65% (1986)

38% (1983)

76% (1975)

62% (1977)

59% (1985)

59% (1989)

0% (1978)

47% (1978)

70% (1987)

0% (1979)

20% (1985)