You could use a running total that resets on group change.
In the Field Explorer, click on Running Total Fields and select New from the toolbar.
1. Name your running total field.
2. Choose which detail field this summarizes.
3. Set type of summary to count.
4. Make sure evaluate for each record is set.
5. Choose reset on change of group and select which group.
Click ok, and place running total field in the group footer.
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