The two pie charts represent differences in the percentage of employees who worked in an engineering company with different degrees and professions in 1980 and 2008.
The charts illustrate the number of employees who worked in an engineering company with different types of higher education certificates in 1980 and 2008.
The pie charts above compare the proportion of people who worked in an engineering company from the perspective of professional areas and educational levels, in 1980 and 2008.