68% (1977)

10% (1970)

53% (1973)

43% (1972)

68% (1977)

57% (1974)

58% (1974)

61% (1974)

61% (1973)

66% (1979)

58% (1977)

10% (1973)

57% (1977)

37% (1973)

23% (1973)