Need Help With Beast Mode| Percentage Change From Previous Quarter

I need help in fixing below code. Current code is getting the value of totals of both quarters:

 

for domo support 1.png

 

 

CONCAT(                              

  -- This portion can be updated to include whatever text or formulas needed    

                'Totals: Q1 '

                ,SUM(CASE  WHEN (MONTH(`Date`) IN (11,12) AND YEAR(`Date`) = 2016) OR (MONTH(`Date`) = 1 AND YEAR(`Date`) = 2017) THEN `Unique Visitors` END )

                ,' | Q2 '

,SUM(CASE  WHEN (MONTH(`Date`) IN (2,3,4) AND YEAR(`Date`) = 2017) THEN `Unique Visitors` END)

)

 

 

But I need to display % change from previous quarter (something like in below screenshot):

for domo support 2.png

 

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