I have data
| Name | Service_Date | Calls_Before_11PM | Calls_After_11PM | Consult_Before_11PM | Consult_After_11PM |
| Office1 | 9/08/2013 | | | 1 | |
| Office1 | 10/08/2013 | 1 | | 3 | 1 |
| Office1 | 11/08/2013 | 1 | | 6 | |
| Office1 | 12/08/2013 | 3 | 1 | | |
And I want to make a pie chart with 4 sections based on the column headers; Calls_Before_11PM, Calls_After_11PM, Consult_Before_11PM, Consult_After_11PM that show the percentage distribution of the number of calls across all dates and Offices.
