XF 2.2 User's Average Post Count?


I am trying to figure out the best approach here. The ultimate goal is seeing what users are participating more than others. Is there a quick/easy way to run a report that would show all users and what their average monthly post count is? I realize this would be different for each month so either having a way to change the month it counts posts for, or specifying a time period like 3 months, 6 months or a 1 year period and seeing what the average number of posts each user had each month during the specified time.

Thanks in advance for any help!