53% (1960)

61% (1959)

44% (1953)

40% (1980)

57% (1946)

60% (1963)

56% (1948)

62% (1964)

57% (1955)

53% (1956)

50% (1951)

55% (1955)

50% (1950)

49% (1953)

50% (1949)

50% (1948)

50% (1951)

48% (1958)

55% (1972)

56% (1975)