46% (1980)

52% (1976)

40% (1978)

40% (1983)

42% (1986)

38% (1978)

44% (1973)

53% (1977)

51% (1977)

31% (1982)

37% (1981)

31% (1975)

32% (1981)

50% (1956)

37% (1983)

38% (1977)

41% (1980)

28% (1979)

45% (1980)

20% (1976)