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Dr.Vita said:
I have a question. What do you do when the sales change?
For instance PS Vita sales, they has been changed in every week of January 2015.

I check all 2015 weeks everyweek to see if something has been adjusted. Then I just change the numbers in my excel file... Which means the numbers in the last update are always  accurate (even YTD). The older updates will have non-adjusted numbers though.