Fewer American workers belong to labor unions than at any time since the government began tracking membership, according to a new report released Thursday.

The Bureau of Labor Statistics said just 10.7 percent of American workers were members of labor unions in 2016, down from 11.1 percent the previous year, and down from 20.1 percent in 1983, the first year the bureau collected union statistics. The number of union workers dropped almost every year during the Obama administration.

“These numbers bear out a trend that’s been underway for some years, and it puts into starker relief the urgency of the moment for labor, now that the Trump administration is in power,” said Joseph McCartin, director of the Kalmanovitz Initiative for Labor and the Working Poor at Georgetown University.

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In 27 states, fewer than one in 10 workers are union members. Just 1.6 percent of South Carolina workers are members of labor unions.

On the other end of the spectrum, nearly a quarter of New Yorkers are members of a union, and almost 20 percent of those employed in Hawaii pay union dues.

More than half of the 14.6 million union workers in the nation live in just seven states — California, New York, Illinois, Pennsylvania, Michigan, New Jersey and Ohio.

The long-term decline in union membership comes as the American manufacturing industry has fallen precipitously. The automotive industry alone, once the bedrock of the labor movement, now employs far fewer people than it did during its heyday.

Federal labor laws, first written after the Great Depression and seldom updated thanks to political gridlock, have hurt the union movement, McCartin said.

“We have a labor law that’s 80 years old, that was created for a different economy than the one we have now,” McCartin said. “As the economy changed and the law remained the same, it became increasingly difficult for unions to organize successfully.”

The long-term trend of declining union membership has been accelerated in some states, where Republican-led legislatures have passed so-called right-to-work laws that allow employees to opt out of paying union dues. Twenty-seven states have right-to-work laws on the books, after Kentucky passed a version earlier this year. Two more states, Missouri and New Hampshire, are moving to implement right-to-work laws in current legislative sessions.

Some companies that once employed thousands of union workers are opting to locate new production and manufacturing facilities in right-to-work states. Boeing, which employs tens of thousands of union workers in Washington, opened a new assembly line that builds its 787 aircraft in South Carolina, a right-to-work state, in 2011.

In recent years, Republicans in such states as Wisconsin and Ohio have targeted public employee unions, one of the last remaining bastions of strong labor participation. Just more than 40 percent of local government employees are members of unions, the BLS reported, the highest rate of any industry segment.

After Republican gains in November’s elections, public sector unions in other states are likely to face new political pressures. In Iowa, Gov. Terry Branstad (R) has proposed ending public employee unions’ ability to bargain over healthcare coverage. Kentucky legislators rolled back prevailing wage laws for public works projects, and Missouri Republicans are considering a similar bill.

“There’s a pretty unified hostility to public sector unionism by Republicans nationally and in many states,” McCartin said. He added that the Trump administration’s freeze on hiring federal workers will hasten labor losses, as government workers who are members of unions retire or find other jobs.

Older workers are most likely to be members of unions, while new entrants into the work force are least likely. Just over 14 percent of workers between the ages of 55 and 64 are union members, while just under 10 percent of those between 25 and 34 belong to unions.