0% (1976)

60% (1975)

0% (1975)

30% (1988)

0% (1976)

40% (1981)

46% (1985)

56% (1987)

67% (1980)

69% (1984)

0% (1988)

0% (1975)

50% (1981)

56% (1981)

58% (1978)

55% (1978)

0% (1979)

59% (1987)

62% (1988)

50% (1981)