How would I Make a Report and/or Graph of the Bandwidth Utilized from My Router?

This sounds like it may be a Netflow thing but can this be done without the Netflow Module?  I specifically would like to see:

1) Average daily bandwidth each of my interfaces are utilizing on my router for the past 2 months

2) The total bandwidth the router has used in the past 2 months

Please advise how this can be done and thank you in advance.