Custom Printers report - Which tables do I have to query?

Hello,

I have around 25 printers monitored by OpManager.

Monthly I need a report of all the pages printed by each printer. (all the printers already have the "Pages Printed" peformance monitor sucecssfully collecting this data)

My question is how to report the current value of the "Pages printed" for all of them?

I tried with custom report but I'm afraid is not posible.
Now I'm trying to build a 'm Crystal Reports to do it but there are to many tables in the database and I could not see the one containing this peformance monitor values.

Anyone know how to get this information from the database?

thank

loda