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Default Create a 12 month rolling average

I have a data sheet with 20 columns that represent 20 months of data (starts
at column b). Monthly data is added for each month. I want to create a
rolling average. The data starts at Row 3 and ends at row 737.

E.g. for Dec 2007, the rolling average would be Jan 2007 to Dec 2007.
e.g. for Jan 2008, the rolling average would be Feb 2007 to Jan 2008, etc,

Thanks

 
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