57% (1971)

49% (1970)

59% (1970)

35% (1971)

52% (1972)

52% (1973)

45% (1972)

47% (1966)

62% (1974)

43% (1971)

49% (1973)

50% (1964)

55% (1965)

60% (1964)

35% (1966)

55% (1964)

57% (1972)

54% (1959)

50% (1974)

65% (1963)