70% (1977)

60% (1982)

72% (1978)

72% (1979)

0% (1984)

55% (1985)

0% (1982)

0% (1979)

58% (1975)

65% (1975)

40% (1976)

55% (1983)

60% (1982)

10% (1983)

10% (1980)

50% (1981)

0% (1981)

10% (1982)

0% (1986)

0% (1975)