Percentage of total column in Pivot Table

[Alam]

I have a pivot table with ID and account as rows, Month (Oct, Nov, Dec) as columns and a total field.

I wish to show the percentage of column total for each month and obviously that'd change dynamically as each item is being filtered on.

[vinieme12]

count(Measure) / Count(TOTAL <ColumnDimension> Measure)

Or

count(Measure) / Count(TOTAL <RowDimension> Measure)

[Alam]

Thank you @vinieme12 it worked perfectly. However, is there a way to keep the values fixed? Currently, the % values change based on whatever we filter. I'm wanting that even when I filter for a specific account type, it shows me as a percentage of the entire month, rather than as a percentage of the selection.