57% (1971)

58% (1970)

49% (1970)

48% (1972)

53% (1973)

54% (1959)

62% (1974)

52% (1973)

51% (1972)

56% (1965)

42% (1971)

57% (1968)

35% (1971)

66% (1966)

50% (1964)

57% (1972)

55% (1964)

65% (1963)

35% (1966)

65% (1966)