Excel 2007 : cumulative percentages in pivot tables

Hi guys!!

i need put in a pivot table the cumulative percentage of an analysis of data, it means like an histogram of frequencies, but pivot table doesn't cumule or don't calculate this, i need help with that; i'm trying to make something like the histogram function of excel but in a pivot table that can change the data trough filters and the pivot table calculate the cumulative percentages automatic depends on the information.


thks