Calculate Percentage Difference to previous state in Funnel Visualisation

[hamadani]

Hi, 

I have a table called "progression" which contains two columns named "case_id" and "stage_name". I have used the Funnel visualisation to get unique cases per stage which looks similar to below:

However, what I am interested in is the "difference of percent of previous stage" when hovering over any stage. So, for instance in the snapshot, I would like to see 10.52% (100-90.48) rather than 90.48% to see how many cases (in percentage) have NOT proceeded to the next stage.

Thanks