Crosstab: Moving_Total

[Los]

I've created a crosstab that has count of employee terminations by month.  The date range displayed is from Jan-10 to Aug-12.  I would like to replace the count of terminations per month with the moving total for the past 12 months.  How can this be done?

Thank you.
Los
(my first posting - just joined)

[RL_Boston]

I've only been able to do Running-Total in a List, not crosstab.  Probably have to do Case statements for each month or month range.