71% (1955)

53% (1966)

50% (1970)

70% (1966)

53% (1961)

48% (1965)

53% (1963)

61% (1959)

49% (1967)

58% (1970)

53% (1965)

70% (1971)

66% (1962)

56% (1965)

58% (1958)

35% (1963)

52% (1968)

43% (1961)

80% (1963)

50% (1954)