Sen. Ron Wyden, D-Ore., left, and Sen. Patty Murray, D-Ore., wait for Sen. Joe Manchin, D-W.Va., before a news conference to press Congress to intervene on behalf of the Affordable Care Act, after a federal judge in Texas ruled it unconstitutional, on Capitol Hill in Washington, Wednesday, Dec. 19, 2018. (AP Photo/J. Scott Applewhite)

Sen. Ron Wyden, D-Ore., left, and Sen. Patty Murray, D-Ore., wait for Sen. Joe Manchin, D-W.Va., before a news conference to press Congress to intervene on behalf of the Affordable Care Act, after a federal judge in Texas ruled it unconstitutional, on Capitol Hill in Washington, Wednesday, Dec. 19, 2018. (AP Photo/J. Scott Applewhite)

WASHINGTON (AP) — The Affordable Care Act has yet again beaten predictions of its downfall, as government figures released Wednesday showed unexpectedly solid sign-ups for health coverage next year.

The Centers for Medicare and Medicaid Services said nearly 8.5 million people had enrolled as of last Saturday’s deadline, with about a dozen states, including California and New York, still left to report. The preliminary number was down about 4 percent, when a much bigger loss had been expected.

Different factors combined to make for an unpredictable sign-up season this year for former President Barack Obama’s health care law, commonly referred to as “Obamacare.”

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On the plus side, premiums stabilized and consumers had more coverage choices.

On the negative side, premiums for the health law’s comprehensive coverage remained unaffordable for many people who don’t qualify for financial help. Also, Congress repealed a requirement for Americans to get health insurance, and President Donald Trump’s administration sharply scaled back advertising and opened the way for competition from lower-cost insurance that covers less.

Then last Friday, a Republican-appointed federal judge in Texas declared the whole law unconstitutional on the eve of the enrollment deadline. Health law supporters are planning to appeal.

Experts said the new numbers show staying power for “Obamacare,” even with its continuing political problems and premiums that remain too high for many middle-class consumers.

“Despite everything that has been thrown at this market, politically, with premium increases and also regulation changes, there is still a core group of Americans who want this insurance and buy this insurance every year,” said Chris Sloan of the consulting firm Avalere Health. “They are a hardy group of people.”

But the number of new customers — the key to growing the market — remained down by about 15 percent when compared to last year.

Wednesday’s figures are for the 39 states using the HealthCare.gov website. Not included yet are totals from about a dozen states running their own insurance marketplaces. Also to be added in later are HealthCare.gov customers who signed up close to deadline or who left phone numbers for a callback.

In a twist, Trump administration officials said the enrollment numbers rebut charges of “sabotage” coming from Democrats. Trump has repeatedly called the health law a “disaster” and last year led an unsuccessful drive to repeal it. White House actions last year were blamed for higher premiums.

Nonetheless, CMS Administrator Seema Verma said that the administration has taken strong steps to run a smooth and efficient sign-up process and that Wednesday’s numbers are “another sign that the administration’s efforts are working.” For example, Verma said HealthCare.gov was down for less than an hour this open enrollment season.

After the Republican-led Congress repealed the law’s unpopular fines for people who go without health insurance, many experts predicted it would lead to a drop in enrollment. But Verma said that doesn’t seem to have happened.

She said the main reason enrollment has continued to gradually erode year over year is because premiums are still unaffordable for people who don’t qualify for help.

But Joshua Peck, who headed marketing efforts under the Obama administration, faulted the Trump administration for ratcheting back advertising.

“Consumer demand for health coverage is extremely high,” he said. “That doesn’t mean the administration is running open enrollment well. In fact, new enrollment — one of the best indicators — has shown a decline.”

The health law provides subsidized private insurance for people who don’t have coverage through their jobs. It also gives states the option to expand their Medicaid programs to cover more low-income adults. Since it passed in 2010, about 20 million people have gained coverage, keeping the nation’s uninsured rate under 10 percent.

Nearly 11.8 million people signed up during last year’s open enrollment season, counting consumers in all 50 states. It’s possible that number could be matched again, after totals from remaining states are added.

“Obamacare” has survived two Supreme Court challenges and dozens of votes in Congress to repeal it wholly or in part. After Judge Reed O’Connor’s ruling last week, another legal challenge is working its way through the courts. The judge agreed with a group of Republican-led states that were seeking to overturn Obamacare.

A group of Democratic senators urged Congress on Wednesday to intervene in the Texas lawsuit in defense of the law. The House is expected to take similar action next year when Democrats retake control of that chamber.