61% (1983)

52% (1980)

69% (1980)

47% (1978)

43% (1979)

20% (1978)

63% (1983)

50% (1981)

65% (1976)

55% (1986)

49% (1974)

70% (1984)

30% (1977)

56% (1977)

58% (1976)

50% (1978)

57% (1979)

50% (1979)

0% (1978)

30% (1981)