In 14 major cities, the average monthly premium for the second-lowest cost silver plan on the Affordable Care Act's marketplaces rose 4.4 percent between 2015 and 2016, according to the latest data from the Kaiser Family Foundation. After tax credits, however, the average premium for the second-lowest-cost silver plan will rise only 1.9 percent. The data also show how widely marketplace premiums vary across the country—while Seattle, Washington's premiums decreased by 10.4 percent, Minneapolis, Minnesota's rose 28.7 percent. The latter increase, which was just recently finalized, is "unacceptably high," Minnesota Commerce Commissioner Mike Rothman tells the Star Tribune. KFF data