55% (1972)

57% (1974)

49% (1973)

55% (1971)

64% (1973)

56% (1971)

59% (1967)

52% (1975)

47% (1974)

52% (1975)

62% (1973)

61% (1963)

50% (1963)

67% (1967)

50% (1973)

63% (1962)

50% (1974)

70% (1974)

20% (1974)

68% (1967)