72% (1978)

60% (1982)

71% (1979)

0% (1984)

68% (1975)

55% (1983)

0% (1978)

59% (1975)

70% (1977)

58% (1985)

10% (1982)

0% (1975)

0% (1981)

60% (1976)

37% (1976)

40% (1983)

60% (1982)

10% (1983)

0% (1986)

0% (1993)