pie chart visualisation problem

Question

i made a pie chart there are 5 record in db 

1. bbb

2. aaa

3. aaa 

4. ccc

5. ccc 

 

i want to show in pie chart as 2 aaa, 1bbb and 2 ccc

but instead it showing 5 division like bbb aaa aaa ccc ccc

 

how to make it as 2 of aaa 1 of bbb and 2 of ccc