Calculate % off another row value with a dax formula

[Dokat]

I have a table name sales and trying to calculate % off gross for each value. I tried numerous dax formulas but couldnt get it to work in Power BI.

Does any one know how to calculate % of Gross for each row in below table in Power BI with dax formula?

Sample

Calendar Year	Customer	PL Line	Values	% of Gross
2019​	ACME Markets	Volume	1972240​
2019​	ACME Markets	Gross	697503​
2019​	ACME Markets	Returns	0​
2019​	ACME Markets	Discounts	3398​
2019​	ACME Markets	OSG	206648​
2019​	ACME Markets	NS	206224​
2019​	ACME Markets	Contribution	-109594​