42% (1986)

49% (1977)

46% (1980)

41% (1978)

41% (1983)

50% (1977)

52% (1976)

44% (1973)

35% (1978)

30% (1982)

43% (1980)

32% (1981)

40% (1980)

31% (1975)

37% (1983)

32% (1984)

34% (1981)

25% (1974)

36% (1977)

38% (1975)