What version of VFP?

>Is there a way to carry a group total (calculated in the group footer) forward into the footer for the next group so that it can be used in a calculation to provide the % change between the 2 groups?
>
>Suppose the report is grouped on year, with columns for each month. In the footer for 2008 we want the calculate the % change for jan08 over jan07.
>
>IE result = (jan08grouptotal - jan07grouptotal) / jan07grouptotal
>
>Thanks