I would firstly learn how to make a chart in Illustrator and there are may tutorials online giving you info on that. I am not going through Facebook and linking my friends to the site in order that I can download the template but basically it is a nested set of pie charts and I have done a few for my old work place but used InDesign for those. Have a look at this Dutch company tutorial here:
http://www.duoh.com/varia/illustrator_charts/
The tutorial is for a simple pie chart which would be your centre pie chart containing the data. The outside pie are just symbols which are transformed and unlinked as a symbol then recolored and the shaped values changed. Hope this helps you complete your task but you are asking a lot of yourself in the skills dept. Maybe try it in Excel first and copy and paste into Illy.
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