46% (1980)

49% (1977)

42% (1986)

50% (1977)

41% (1978)

44% (1973)

41% (1983)

52% (1976)

35% (1978)

40% (1980)

25% (1974)

31% (1975)

34% (1981)

43% (1980)

32% (1981)

37% (1983)

47% (1964)

32% (1989)

48% (1975)

36% (1977)