Health spending in the U.S. grew to $3.2 trillion in 2015, fueled partly by the expansion of health insurance to millions of people under the Affordable Care Act, according to a new estimate published in the journal Health Affairs.

The study also looks forward, projecting that through the next decade, national health spending will climb at 5.8 percent per year, on average, to encompass a fifth of the economy by 2025.

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