Crystal Reports - Display count of zip codes for each zip code

Hi,

I'm having a mental block at this time and can't even think of the proper terminology.  As always any help is apreciated.

Report Data Example:
100 Clients each with demographic information such as name, address, phone, etc.
25 clients 33232 zip code
50 clients 31111 zip code
10 clients 32222 zip code
15 clients 33333 zip code

When I use the chart wizard, I end up getting a nice pie chart which shows the count for each zip code.  My questions is how do I perform this manually?  For example how can I have the output on the report footer to state 33232 25, 31111 50, etc?  I like the chart, however I would like to be able to export this data to an Excel spreadsheet.  (In my example I only list 4 but tyipically I would have hundreds of zip codes, thus the reasons for not retyping this data in Excel from the pie chart.)

Thanks again!