Custom Table - Difference Between todays number and yesterdays number

I have a Look and one of the columns is “Total Screened To Date”. I have the report scheduled to send on a daily basis. I have been asked to add a column that shows the deviation from todays “Total Screened to Date” versus yesterdays “Total Screened To Date”. I am having some issues creating a custom table, etc. Any guidance - I cannot figure this out?

Ideally it would be layed out like the image below. Thoughts? 

2579990f-315d-4fcd-9090-65630dd98023.png
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