43% (1972)

61% (1974)

61% (1973)

58% (1977)

68% (1977)

52% (1973)

69% (1977)

57% (1974)

56% (1974)

66% (1979)

10% (1973)

57% (1977)

37% (1973)

10% (1970)

23% (1973)