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Note that these pageviews exclude pageviews on the mobile domain (m.wikipedia.org) and in the mobile app. Views until December 2015 include bot pageviews, while those from January 2016 exclude identifiable bots and spiders (but may still end up counting many views by bots and spiders as legitimate human views).
There is now a more powerful website available if you're interested in visualizing trends. It's called Wikipedia Trends and is unaffiliated with Wikipedia Views.