62% (1983)

51% (1980)

63% (1983)

47% (1978)

50% (1978)

43% (1979)

69% (1980)

55% (1986)

56% (1977)

70% (1984)

49% (1974)

30% (1977)

65% (1976)

50% (1979)

0% (1979)

20% (1978)

30% (1981)

50% (1981)

0% (1978)

0% (1978)