56% (1960)

63% (1963)

51% (1966)

60% (1954)

50% (1966)

50% (1970)

59% (1958)

58% (1970)

54% (1954)

55% (1962)

40% (1958)

0% (1973)

53% (1964)

65% (1957)

31% (1958)

59% (1961)

45% (1951)

40% (1969)

60% (1972)

20% (1965)