How to find difference between 2 rows, but only if data exists in both rows?



I'm trying to make a formula that says 2020 Experiential Audit minus 2019 Experiential Audit = value in Experiential Audit YOY change...but only if there is data in both 2019 and 2020. See my sheet below.

I think this is an IF formula but I dont know how to say If there is a number...

Thank you in advance!

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