Statistics for IT Department

Senior Management has requested that the IT Department provide statistics on the various functions and services the IT Staff performs. The statistics are to be monthly, and need only quantify number of items handled. The Statitics report will not measure Staff time spent for now.
I have some ideas on how to go about this. I just want to know if other readers of Tech Republic have forms or procedure on how to document statistics for an IT department of 12.
Any help will be appreciated.