75% (1955)

57% (1970)

50% (1949)

40% (1972)

52% (1971)

53% (1964)

64% (1958)

35% (1956)

50% (1971)

80% (1965)

43% (1973)

55% (1954)

50% (1958)

57% (1967)

51% (1963)

50% (1959)