Lansweeper can only give back the total amount of pages printed as given by the printer via SNMP. What you could do is create a report that gives you the total amount of printed pages per printer. You can use the e-mail alert function in Lansweeper to receive the report every week. Information on email alerts can be found here: https://www.lansweeper.com/kb/113/sending-email-alerts.html
If you have reports from multiple weeks, you can compare the total amount of pages printed. This will let you see how many pages are printed per week.