Reporting on how many channels on a trunk are used?

I would have sworn I could see this info, but it seems the mind is failing me, and my google fu seems to be out to lunch.

I have 10 channels on a trunk to on my Asterisk 1.8 server with FPBX 2.9 for the management. I am trying to find out a way to get a report on how heavily the trunks channels are being used. We are going to add a bunch more phones to the system, and I am trying to figure out if we need to add more channels, or if the current 10 are just being underutilized.

Is there any way in FreePBX to get a report on the channel loading of a trunk, or of all available trunks on the system?