Here's how many people watched 13 recent Netflix original shows, based on tracking data

Netflix is notoriously secretive about its data, especially when it comes to how many people are watching its shows.

Earlier this year, NBC kicked off a firestorm when its head of research claimed a startup called SymphonyAM had uncovered the secret of how many people were actually watching Netflix. Netflix fired back, calling the data "remarkably inaccurate," and taking shots at NBC's own low ratings.

But since then, SymphonyAM has continued to track Netflix shows (for a full explanation of how, see our interview with its CEO). And it now has enough data to give a good comparison of a slate of Netflix releases for one "season." In data provided to Business Insider, SymphonyAM observed the period from September 21 to May 2, and estimated how many 18-year-and-over adults watched new Netflix originals within 35 days of their release ("live + 35").

There were a few surprises in the data, notably that "Fuller House" completely smashed the competition.

Here are 13 Netflix originals released during that period, and how many millions watched them: