50% (1979)

57% (1983)

52% (1985)

56% (1979)

46% (1985)

70% (1982)

0% (1972)

0% (1984)

40% (1981)

0% (1984)

35% (1974)

0% (1986)

0% (1977)

0% (1974)

0% (1972)

40% (1973)

0% (1972)

0% (1976)