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The graphic on the right shows how President Obama's public health reform impacted the percentage of non-elderly Americans (18 to 64 years old) with no health insurance: in the summer of 2013 they peaked at more than 22%, just before steeply declining to just 16% in May this year.
The number declined by almost 5 percentage points between January and June this year alone.
The Financial Times quoted a paper from the president of the White House's Council of Economic Advisors, Jason Furman, who claims the decrease as one of the biggest legacies of the Obama administration.
The data come from a special report of the New England Journal of Medicine that calls the Affordable Care Act "the most ambitious attempt to expand health coverage in the US in decades."
The NEJM found out that since the open-enrolment period began in October 2013, "the number of Americans without health insurance "declined significantly."
Open enrolment is the period in which people can apply for a plan under the new act. The next window to apply opens between Nov. 15 and Feb. 15 next year, and will allocate plans for the whole 2015.
The NEJM report estimates that about 10 million adults gained coverage, mainly among African Americans and Hispanics. (This number sits within a wider range of 7 to 17 millions as a margin of error.)
A decision from the Supreme Court in June 2012 allowed singular States to opt out of the expansion of Obamacare, bringing huge differences between those parts of the country that expanded their coverage allowance and those that didn't.
In States like California, New York and Illinois, which adopted the expansion of Obamacare, the decline of uninsured people was about 6 percentage points in the first 6 months of this year, compared with only 3.1 percentage points in states that opted out, like Texas, Florida and North Carolina.
The Financial Times concludes that, although new data could change the scene in the future, the decline in uninsured "seems like one of the most under-discussed trends of the year."