Hydraulically fractured wells now produce about two-thirds of the nation's natural gas output, up from less than 7 percent in 2000, according to an analysis released Thursday by the U.S. Energy Information Administration.

The EIA's report follows on a March analysis that showed fracking accounts for about half of current U.S. crude oil production. The last decade's dramatic increases of domestic gas and crude oil production from fracking has contributed to a decine in energy prices.

Pennsylvania is the nation's second largest producer of natural gas, almost all of it produced by fracking the Marcellus and Utica Shale formations.

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