HARTFORD, CT — The fourth health insurance enrollment period ended last month with 4,495 fewer Connecticut residents signing up for private plans through the exchange.

There were 111,524 residents who signed up for plans in 2017. Last year, more than 116,019 signed up.

State officials in charge of the marketplace created by the Affordable Care Act said it’s unclear if the 3.9 percent drop in enrollment represents an increase in residents insured through other types of healthcare coverage through their employers or off-exchange, or if it’s an increase in uninsured residents.

James Wadleigh, CEO of Access Health CT, said the fourth and possibly final year of the Affordable Care Act was a success because “we were able to reach, enroll and re-enroll tens of thousands of customers — despite uncertainty about the ACA — and a significant number of these people are new members.”

Lt. Gov. Nancy Wyman, who co-chairs the Access Health CT board of directors, said “These numbers represent a fairly stable enrollment cycle and demonstrate the importance of the state’s marketplace in getting residents covered.”

Residents had fewer insurance companies, just two, and 21 fewer plans to choose from this year. Monthly premiums also increased an average of 25 percent.

The fate of the Affordable Care Act is currently being debated by a Republican-controlled Congress, which has moved toward repealing it without any clear replacement strategy in place.