Pivot - adding a calculated field

Hello,
Is there a way to add a calculated field that divides data by a variable? The attached sample file contains a Pivot table summarizing sales and cost data (Sales Volume, Fixed Costs, Revenue, Selling expenses, Variable costs) for multiple years and multiple companies (A & B). The Pivot has Company and Year Filed in Filters. I need to add a column to the Pivot which will calculate the sales and costs data (Parameters) per Sales Volume (one of the parameters), by dividing the parameters (fixed costs, Revenue, Selling Expenses) by the Sales Volume (Items Sold). The data Pivot should recalculate every time the new filter (company and year) is applied.
Thank you!