What kind of numbers do you want? Last month we used 200TB+ in bandwidth across all our sites, no bandwidth charges from CF.

120TB of that is our CDN backed by a Cloud provider, we had to only pay them for 3TB in bandwidth charges.

During peak traffic they serve 35% of our pages because of their cache, with some site improvements we will be able to up that to 60% soon.

Edit: I must add that we are on the Pro plan and do use multiple paid features like Workers and Load Balancers.