thats exactly what i need the variance %
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Coolio...so I'd have suggested the way that Mihai has suggested, using a Quick Table Calculation
Table Calculations are a particular type of calculation (in Tableau) and can run differently, depending on what "compute using" you define. By default Tableau sets this one up a Table (Across)
and as your months run across the top of the page, it calculates it as you want.
Let me know if that doesn't make sense.