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and it's easier to leave it like that since, as you apparently discovered, it probably "rounded " to come out about the same values for NSA vs SA (which would probably correspond to a "regular cycling" of data throughout a typical year - EXCEPT if something weird happens during a particular month or months). It's possible too that they might "normalize" that raw NSA data too, to smooth out any one-off anomalous months, and that allows for looking at any trending.
And yeah, Excel can be quirky at times... I miss the old Quattro Pro. 
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