How much bandwidth is your MDaemon server using?

I recently found myself working on a project where I needed to calculate how much bandwidth the average MDaemon server uses - I'm hoping if you're an MDaemon user, you'll be able to help me out here. Every server's usage is different of course - bandwidth will vary depending upon the number of users and the type and the number of emails, but I knew if I could arrive at an average across a handful of customer sites I'd be able to get close enough for my needs.