How to limit reporting results to return only the top 10 highest aggregated numbers?

Summary

Trying to run a report of the top 10 schools where staff have degrees listed

Content

I would like to see a pie chart graph of the top 10 schools where our staff have degrees based on specific filters (like major) on a dashboard.  I am able to limit the results for a pie chart graph to show, say, all schools with 40 or more degrees, but what I would like to do is have it dynamically return the results in a pie chart of just the top 10 rather than specify a limit number.

Any guidance would be appreciated.

Thank you!

Julia