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A few questions - are you looking to keep both the original weekly information and the delta in the same file - or will the new version only be the delta? Also - how do you plan to treat records where you had no instances the previous week (ie one file has 4 records, one file has 3 records).
This version shows you only the delta and has week 2 come after week 1- I do no know if that is a fair assumption.