User blog comment:DaNASCAT/Technical Update: January 25, 2016/@comment-5558012-20160126185238/@comment-126761-20160126192709

The simple answer is: different stats, different methodologies. There's been a lot of work over the past few years that affected how stats were gathered (a major reason for the retirement of some the older stats features).

Regardless, I would say the most useful info from the new list is not really the exact numbers, but the relative positions of the articles on the list.