59% (1980)

50% (1983)

40% (1980)

53% (1979)

42% (1961)

45% (1988)

45% (1969)

41% (1976)

39% (1985)

34% (1969)

53% (1985)

27% (1964)

52% (1976)

53% (1980)

43% (1974)

56% (1987)

47% (1960)

66% (1980)

49% (1985)

46% (1980)