I don't think there is a way to capture extra payments to mortgages as a form "savings" since lenders aren't required to report such information. Its the same way for 401K contributions (pretax) or ROTH (post tax) since they are privately held, controlled, and managed.
Bank deposits on the other hand are required and monitored by the FDIC and Federal Reserve.
There is also the notion of "fair" reporting practices comparison of various countries. They all adhere to sets of standard requirement of reporting that are publicly available and provable so data made for comparisons are "real" and aren't somehow made up.
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