Premiums for the most popular plans sold through the Affordable Care Act insurance marketplaces will drop by 4 percent on average next year, the Trump administration announced this week.

The 4-percent price decline marks the second time that average monthly premiums have dropped from year to year since launched in 2014. Open enrollment for the ACA marketplace starts on Nov. 1 amid a pending lawsuit challenging the constitutionality of the ACA’s individual mandate.

The Trump administration, which supports the lawsuit, still sought to take credit for the stabilization of the ACA marketplace.

“The ACA simply doesn’t work and is still unaffordable for far too many,” said Health and Human Services Secretary Alex Azar on Oct. 21. “But until Congress gets around to replacing it, President Trump will do what he can to fix the problems created by this system for millions of Americans.”

The average premium for the benchmark plan will drop from $406 to $388 in states relying on the federal marketplace, HHS said. Roughly two-thirds of enrollees who receive subsidies, who make up about 87 percent of the market, will pay less than $75 per month in premiums if they keep the same coverage.

Azar said there will also be 20 more insurers selling plans next year in the federal marketplace, which is used by 38 states. The total number of insurers selling plans in the federal marketplace will be 175, the largest number since 2016.