The Ad units report lets you see the monetization performance of all your ad units. If you’re interested in the performance of individual ad units, you can use the filter to limit the data to specific ad units.
Note: Reporting data is limited to the last 3 years and doesn’t include data from YouTube or AdMob.
Learn more about the changes to reporting data in AdSense reports.
View the Ad units report
Visit your Reports page, then click Ad units in the list of reports.