70% (1977)

0% (1984)

72% (1978)

60% (1976)

59% (1975)

71% (1979)

58% (1985)

37% (1976)

0% (1986)

10% (1980)

0% (1979)

0% (1984)

0% (1981)

60% (1982)

63% (1979)

60% (1982)

0% (1975)

10% (1982)

0% (1982)

55% (1981)