You can use the table calculation as below to calculate the YOY Growth
Ex: (ZN(LOOKUP(SUM(sales),-2))-ZN(LOOKUP(SUM(sales),-1))) / (ZN(LOOKUP(SUM(sales),-1)))
Compute the above sample calculation to Table Across.
Please let me know in case of any issues. Please mark the answer as helpful and correct if it resolves your question.