52% (1981)

67% (1982)

55% (1977)

50% (1981)

48% (1974)

51% (1978)

45% (1980)

34% (1974)

56% (1973)

52% (1980)

24% (1976)

39% (1983)

50% (1981)

30% (1978)

30% (1976)

44% (1970)

35% (1978)

10% (1972)

37% (1978)

45% (1983)