EMC/NetSight is an additional product that you have to purchase. Although there are trial licenses available, and I strongly recommend you give it a go. The licensing is dependent upon the number of devices you have. Access Points are not considered in the device count. It's more counting your controllers, switches, or whatever you want to track and manage. There is a wireless reporting area in there that is FANTASTIC! Ask your sales rep for a demo and you will know you need it. 😉
Anyhow - you can still get a little bit of reporting from the controller itself. I am trying to remember when the reports got good in the controller firmware. It may not have been until version 10. Do you have a "Reports" tab across the top of the page on your controller? If so - you can click Reports > APs (on the left) > Wired Ethernet Statistics. That will show you, in bytes, how many packets are being sent across the wire. There may be an easier way - but that is the best method I can see.
If you are not seeing any of that, I would suggest upgrading to the latest code. Version 10 has some great new features and reporting is one of them.