The pie charts detail how the qualifications of employees in an advertisement company changed between 1990 and 2010.
Overall, Phd science, phd art, Master art showed an increase to varying degrees at the expense of the decline in first degree science, first degree art, while the proportion of Master science contributed the same. The figure for Phd science overtook that for Master science, which was initially the highest, whereas the qualifications of staff in First degree was the least in the end.
In 1990, it was Master science that had the highest proportion among the others, with 29%, followed by the percentage of Master art, with an 8-percent difference, which was just higher than that of First degree science(20%). The rest was shared by First degree art (15%), Phd science (12%), and Phd art (2%), accounting for the lowest proportion.
In 2010, the figure for Phd science had much higher proportion, with an 18-percent rise compared to 1990, holding the highest share. While that for Master art and Phd art also held a higher percentage, with both having a 2-percent increase, the proportion of Master science remained unchanged.
At the expense of these, the qualifications in both first degrees (Science and Art) had a reduction in their shares, with the former contributing 11% and the latter having only 2%, the biggest reduction in the chart.