57% (1971)

49% (1970)

59% (1970)

55% (1959)

35% (1971)

62% (1974)

60% (1964)

52% (1973)

47% (1972)

43% (1971)

47% (1966)

49% (1973)

55% (1965)

66% (1966)

57% (1968)

35% (1966)

50% (1974)

56% (1965)

52% (1972)

0% (1966)