The pie charts above depicts the distrubution of of qualification among staff at advertising company between 1991 and 2010.
Overall,Its evident that the qualification of First degree art and science declined substantially, whereas the figure of PhD science and master art increserd considerably. Additionally ,the categories of PhD art rode slightly,while the propotion of master-science remained unchanged.
In detail, the categories of staff with a first degree and science dropped from 15% to 2% and 20% to 11% during this period,whereas the figure of PHd science and master art modest growth from 12 % to 30 % and 21% to 23% between 1990 and 2010. Meanwhile, the qualification of master science relatively stable stood at 29 percent . The phd science experienced significant growth,while First degree science experienced decllne. The former was higher than letter
