58% (1971)

58% (1970)

57% (1968)

51% (1973)

62% (1974)

48% (1972)

53% (1973)

57% (1972)

35% (1971)

49% (1970)

50% (1964)

65% (1966)

42% (1971)

55% (1959)

60% (1965)

0% (1966)

56% (1965)

0% (1962)

70% (1958)

60% (1964)