You'll first have to be either an Owner, Developer Admin, or Developer of the Extension to be able to access your Extension Statistics, 

To navigate into your Extension's statistics page,

1. Go to your Extension's project page.
   
   
   
2. Select an Extension.
   
   
   
3. Click on the Statistics button at the top.
   

Explaining the Statistics Page

The first thing showing on the page are pie charts sitting under each CET Editions.
These pie charts show how many users are using which editions of CET and the types of licenses.

Under the pie charts, is the User Map.
This shows where your users are mostly located across the globe.