Adsense will stop allowing publishers to see their data older then 3 years
Google currently displays this info in the Adsense backend:------------------------------------------Last 3 years of reporting dataWe've limited reporting data for all AdSense products (Adsense for content, AdSense for search, etc.) to the last 3 years. This means that you can only run reports for data that's less than 3 years old.You can download data that's older than 3 years from either the...