Since the population only increases in our area, you'll never see a reduction in the number of employees needed in the public sector unless it's from automation. It's quite likely that the same number of employees have been doing more work due to more residents in the area without you ever knowing. 

By the way, bonuses are not always based on a single employee's performance - often it's just based on the company's performance as a whole. 

As a government worker, I can tell you that efficiency and performance metrics in the public sector are evaluated far more that you've ASSumed them be.