If you have a premium GlassFrog account, you can view detailed statistics about your organization's circles.  Click the Holacracy Stats link in the Organization section of your user menu to access the organization-wide statistics page.

Here you can see information about each of your organization's circles, such as the number of roles and members in a circle, how long it has been since the last Tactical (aka Operations) meeting, or how long since the last Governance meeting, or the average number of proposals each circle has processed per month. 

If you have premium access, feel free to check it out!