New data show that fewer than 1 in 10 Americans lacked health insurance in 2015, a sign that the uninsured rate has declined again.

A federal survey found that the uninsured rate was 9.1 percent, down from 11.5 percent in 2014. About 28.6 million people were uninsured last year, down by more than 7 million from 2014, according to the National Health Interview Survey released Monday.