Hello Ba'da, here some suggestion for you
These three pie charts show the changes in annual spending by a...
1) DON'T COPY PASTE THE QUESTION. You must PARAPHRASE it. If you don't know the synonym of the world, minimum you can CHANGE THE FORM from POSITIVE to NEGATIVE sentence
... trend of teachers' salaries. In contrast / However / Despite / Whereas There was a downward trend ...
2) USE CONJUNCTION to CONNECT YOUR IDEA.
Based on the pie charts, the largest number came ...
3) TOO FEW EXPLANATION. You can explore it to be more details. That indicators also has change and data in 2001, but you did not mention ANYONE.