28% (1985)

45% (1986)

37% (1977)

44% (1988)

44% (1975)

53% (1978)

46% (1967)

43% (1986)

37% (1986)

24% (1984)

39% (1975)

39% (1972)

10% (1984)

56% (1987)

33% (1983)

100% (1981)

40% (1972)

34% (1972)

55% (1973)

30% (1963)