Email Send Data & PowerQuery

Hi guys

So, my email marketing platform aggregates daily send data, rather than displaying what was sent on which day making performance reporting difficult.

On Monday, 5 emails would be sent. On Tuesday, 6 emails will be sent. BUT, in aggregate fashion, it will display the total results for Tuesday = 11.

I need to be able to use a PowerQuery function that will take:

(Todays send data) - (Yesterdays send Data) = Todays send

And this query MUST be already set and ready for Wednesdays set of data.

Thanks!