Variance between Fiscal Years in Profit Margin by key figure report

[S4_Hana]

Hello,

Report Profit Margin by key figure: In the table view (opposed to a graph) I want to create a key figure ("Difference" see below example) that will calculate the year to year difference of the Net Sales Revenue amount.

For example:

2017 2018 2019

Net Sales Revenue Net Sales Revenue Difference Net Sales Revenue Difference

$1000 $1500 $500 $2500 $1000

Can anyone advise me on how to do this using the key figure functionality?

Thanks