72% (1978)

60% (1982)

71% (1979)

58% (1985)

59% (1975)

68% (1975)

70% (1977)

0% (1984)

55% (1983)

64% (1979)

10% (1982)

37% (1976)

50% (1981)

55% (1981)

0% (1982)

0% (1986)

0% (1986)

0% (1981)

10% (1983)

0% (1975)