69% (1956)

61% (1971)

58% (1972)

66% (1973)

59% (1975)

62% (1953)

63% (1972)

67% (1947)

54% (1975)

67% (1979)

43% (1974)

51% (1973)

53% (1973)

52% (1972)

56% (1960)

52% (1977)

0% (1973)

35% (1973)

0% (1961)

50% (1945)