66% (1973)

61% (1971)

58% (1972)

69% (1956)

62% (1953)

56% (1960)

59% (1975)

67% (1979)

62% (1970)

54% (1975)

52% (1977)

53% (1973)

67% (1947)

43% (1974)

63% (1972)

51% (1973)

58% (1957)

50% (1945)

35% (1973)

52% (1972)