How to get time wise sales report in mysql

Question

hai,

I need Time Wise Sales Report in mysql,I get the Report like ,

 

Time       Amount

19:00:00       2

20:00:00       3

21:00:00       0

22:00:00       0

23:00:00       9

 

but I need sum the  Amount each time like

 

Time          Amount

19:00:00          2

20:00:00          5

21:00:00          5

22:00:00          5

23:00:00          14

 

 

This is My Query

 

SELECT concat(MID(date_of_call, 12, 2),':00:00') TimeIntervel,COUNT(*) TotalEntries,date_format(date_of_call,'%d/%m/%Y') FROM ICC_MM_setup_suply
WHERE DATE_FORMAT(date_of_call,'%d/%m/%Y')='31/01/2017'
GROUP BY concat(MID(date_of_call, 12, 2),':00:00')