Historical number of stations per AP (Meru)

Hi,

We have our Meru 4200 controller along with all AP's plugging into NPM and we can see lots of useful data however, we can only see realtime stats for number of stations connected per AP (client count).  Is it possible to record this stat?  Ideally we want to be able to click on a single AP and see how many clients were connected at a certain time.

We are running http://www.solarwinds.com/Orion Platform 2014.1.0, SAM 6.1.0, NPM 10.7

Thanks,

Graham