52% (1950)

52% (1955)

55% (1952)

43% (1956)

47% (1966)

30% (1953)

64% (1970)

37% (1973)

68% (1963)

40% (1979)

40% (1956)

53% (1955)

60% (1956)

20% (1958)

23% (1952)

30% (1953)

0% (1961)

40% (1971)

55% (1956)

45% (1953)