We keep a 6-month view of your tenants and licenses. This detail allows you to see when changed over that period.
To access the graphs, click your name from the top right navigation bar, and click Billing & Licenses.
View total license counts
The total licenses count graph shows then number of licenses within a specific period. Hover over the graph to see how many licenses were added to your account. A tooltip will show the number of licenses for that period.