57% (1967)

54% (1966)

50% (1959)

65% (1968)

67% (1971)

71% (1952)

50% (1958)

50% (1959)

58% (1966)

52% (1971)

55% (1954)

51% (1963)

43% (1973)

50% (1971)

40% (1972)

35% (1956)