most common value per customer per year?

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For a mid-sized digital printing shop (not a multi-million dollar one), what is the most common revenue per customer per year.

I know some customers are way bigger than others, and some are tiny, but I want the most common and perhaps the average. So lets say a shop is $1mill/year, how many customers can I expect to find in the CRM if it had all the customers in there? (that'll give me the average)

Another useful piece of info is the average size of a job along with the average jobs/year for customers.

Any thoughts would be most appreciated.

I imagine this differs most if its downtown or not downtown. Thoughts on that?