62% (1983)

51% (1980)

47% (1978)

65% (1983)

65% (1976)

69% (1980)

20% (1978)

55% (1986)

0% (1978)

30% (1977)

43% (1979)

58% (1976)

50% (1979)

50% (1978)

70% (1984)

60% (1978)

50% (1978)

56% (1977)

49% (1974)

50% (1981)