Over the last year (May 2011 to May 2012), the category with the biggest drop in price was "Utility (piped) gas service" (residential natural gas), which has decreased by -14.9% over the last 12 months.
Thanks to the shale revolution and falling natural gas prices, U.S. consumers have saved $35 billion in 2009, 2010 and 2011, and it looks like those savings will continue in 2012.
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