Qlikview - Variation in pivot table

[cvalarcon]

Hi experts,  I have this pivot table created from one excel file.  I have 3 levels in this Pivot table 

1. Product
2. House
3. Seler 

The Proporcion field is working fine with this formula in the Expresions:

=if(Period=$(vPeriodo1)and Dimensionality()=1,count(Product)/count(total<Period,>(Product)),
if(Period=$(vPeriodo1)and Dimensionality()=2,count(Product)/count(total<Period,>(Product)),
if(Period=$(vPeriodo1)and Dimensionality()=3,count(Product)/count(total<Period,>(Product)))))

So I like to know wich is the best way to have an additional column with the quantity variation between the last period (in this case 201903) and the Last period -1 (201902)  (orange column).  

And the reletion should be available in all Dimensions.

Thanks in advance.