According to a recent analysis of enrollment on the federal health insurance exchange in 2016:

• Of the 9.6 million Healthcare.gov shoppers, one third (3.2 million) kept their previous health plan.
• 25% of all Healthcare.gov shoppers (2.4 million) chose a different plan from their 2015 choice.
• New enrollees to the market comprised 42% of Healthcare.gov shoppers, down from 53% in 2015

Source: "Only 33 Percent of Exchange Enrollees in 2016 Kept Their Same Plan from 2015," Avalere, March 31, 2016, http://avalere.com/expertise/managed-care/insights/only-33-percent-of-exchange-enrollees-in-2016-kept-their-same-plan-from-201