Wifi Counter Software

I work at a small library with a matching budget. In the course of our job, we are asked to fill our statistics for different things. Recently the question "how many people access your wifi a day" has been added to the survey. I have been searching for a program to track our wifi traffic, without much success. The program I am looking for would count how many people use the wifi connection each day. It needs to run constantly (online) so that the number will be as accurate as possible. There has to be some kind of report feature so that accessing the numbers is not too difficult. The only other requirement would be that the program not be too expensive. Does anyone know a program that would fit this criteria? Thank you in advance for your help.

 

What brand is the access point? You have admin rights to it?

 

What wireless switch/router do you use?

There are some awesome switches out there that can do this for you. Pending on your budget.

 

Also maybe this can help...
http://www.majorgeeks.com/files/details/wireless_network_watcher.html
From Nirsoft:
Starting from version 1.15, there is a new option under the Options menu - 'Background Scan'.
When it's turned on, Wireless Network Watcher first make the regular fast network scan to discover all current connected devices. After that, a continuous background scan is activated to discover when new devices are connected to your network. The background scan is slower and less intensive then the regular scan, so it won't overload your computer and you can leave it to run in the background while using other programs.