69% (1956)

67% (1973)

60% (1972)

61% (1971)

63% (1953)

40% (1974)

53% (1973)

67% (1947)

68% (1979)

48% (1959)

58% (1957)

54% (1975)

57% (1975)

56% (1960)

35% (1973)

53% (1977)

63% (1970)

51% (1973)

20% (1961)

57% (1974)