63% (1975)

72% (1972)

61% (1976)

65% (1972)

63% (1980)

62% (1979)

62% (1976)

53% (1972)

59% (1977)

69% (1975)

53% (1979)

56% (1977)

72% (1978)

65% (1978)

0% (1977)

61% (1974)

58% (1978)

58% (1972)

55% (1977)

64% (1973)