Consecutive Year Donors

We are working with a consulting firm who has asked us for some data on our donors.  One of their questions is "How many donors have supported you with a gift the past 3 years in a row?"  (They also want this information for the past 10 years in a row.)  Does anyone know of a report that would give us this information?  If not, has anyone figured out a good way to manually calculate this?  Thanks in advance!

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