Deducting each previous columns

Visitor

Hi, 

 

I have a set of data showing cumulative totals monthly. in e.g. in column for December( is cumulative of Jan to November). Is there a formula to subtract each month from previous month figures.

I'm using the copy --paste special -- subtract columns-and its taking ages and not efficient. I need to solve this very badly.

 

Is there any easy way/formula to subtract previous columns?

 

 

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