60% (1976)

71% (1972)

64% (1980)

64% (1972)

61% (1976)

56% (1977)

69% (1975)

72% (1978)

63% (1979)

52% (1979)

61% (1974)

53% (1972)

63% (1975)

59% (1977)

42% (1978)

58% (1978)

65% (1978)

59% (1972)

0% (1977)

64% (1973)