WRC - Financial Information

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Hi folks,

I am writing a report in uni for a Sports Marketing class. I'm doing it on the WRC as F1 was already taken. However i am struggling to find any kind of financial information (i.e team budgets, FIA budgets, etc)

I know its a long shot but does anyone know where i can find this kind of information?

Even an annual report from the FIA or any team would be brilliant!