That's low ratings as a percentage of total population.
College football viewership exceeds many NFL teams. The NFL attempt to expand into Europe shows they know they can't stem the decline in the U.S. and instead will chase overseas viewers.
No wonder they're pimping Taylor Swift and other celebrities at NFL games.
Those are the numbers for the premium Sunday ticket subscribers, not total viewership.
The top rated tv shows are NFL games, every week of the season