Difference in % between two columns in a Crosstable

I have a cross table as the example below and need to add a column showing the difference of column B vs. column A in %.
The aggregation Difference % Year over Year is not working for me in this scenario.

Product
Sales Previous Year (B)
Sales Current Year (B)
Diff in %
AAA 150 120  
BBB 200 250  

 

 

 

Regards,
Bernhard

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