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Here's the Wikipedia entry for HealthSherpa:

HealthSherpa is a California-based technology company focused on connecting individuals with health coverage. The site was initially developed as an alternative to research plans from, and now provides individual health, dental and vision benefits to both part-time employees and retirees. As of February 2017, over 800,000 people have been enrolled in individual health coverage through HealthSherpa.

First, I want to clarify that I'm not shilling for HealthSherpa here. They aren't paying me for this post. I have no idea whether their customer service is awesome or sucks or anything like that.

Having said that, they are a pretty good resource for getting a feel for what the big picture situation is regarding open enrollment trends each year, and they have provided me with some internal data which they've OK'd me to share publicly.

It's important to note that all of the data here refers to exchange-based enrollments only. They reiterated to me that their individual market enrollments are on-exchange only: