59% (1975)

50% (1955)

70% (1962)

58% (1965)

38% (1960)

43% (1956)

58% (1980)

57% (1975)

56% (1973)

43% (1970)

35% (1972)

65% (1974)

52% (1978)

34% (1969)

36% (1958)

67% (1972)

38% (1968)

40% (1979)

32% (1958)

39% (1956)