The provided pie charts compare six types of the qualification of staff in an advertising company from 1990 to 2010.
Overall, almost all the proportions of employees in an advertising company increased to varying degrees, especially PhD-Science level, with exception of first degree science and first degree art, which showed a dramatic decline and master science remained relatively stable. The PhD-Science had the highest level, while First Degree-Art had the lowest during the period.
In 1990, the largest group of staff took a Master in Science 29%, followed by a Master in Art at 21%, and First-Degree in a Science 20%. A smaller portion had a First degree in Art at 15%,and PhD in Science at 12%, while the only PhD in Art had a 2%.
By 2010, PhD in Science rose sharply to 30%, making it the most common qualification. Master holders in Art and PhD holders in Art increased modestly by 2% and 3%, in turn, while the percentage of staff with a First Degree in Science remained unchanged both years with 29%. The employees’ First Degree in Science and First Degree in Art experienced a noticeable reduce to 11% and 2% at the end of the period.