How do I create a report that shows % of usage of the Wan Interface?

How do I create a report that shows % of usage of the Wan Interface?

Hi all, I have a few circuits range from 512k, 768k, 1024k, how can I create a report that show how often the circuits have been overdriven and saturated in  span of say a month?
 
Thanks in advance for your help
 
Ed ksaibat
 

                New to ADSelfService Plus?