My simple OpenOffice spreadsheet for tracking Unity Asset Store revenues per-asset.
http://t-machine.org/wp-content/uploads/UnityAssetStoreRevenues-Template.ods
Usage/setup instructions included on the first page (scroll down).
To fill in the data, I use a script that scrapes the Unity publisher portal. But for short periods of time, you can easily fill this in by hand. My script needs some cleanup before I share it – some recent changes to the Unity webpage broke it and I haven’t updated it yet.