69% (1977)

68% (1977)

54% (1973)

61% (1973)

61% (1974)

43% (1972)

57% (1974)

58% (1974)

58% (1977)

23% (1973)

37% (1973)

66% (1979)

10% (1973)

57% (1977)

10% (1970)