Wikimedia:Pageviews-faq-old-data-body/en

The Wikimedia pageviews API was introduced in August 2015 and has backfilled data to July 2015. You will have to rely on other tools such as <a href='http://stats.grok.se'>stats.grok.se</a> to view data older than this. Whether or not they work is unfortunately outside the scope of this tool, and beyond the control of the maintainers.