Natural gas was down on Friday after a survey published by the KPMG LLP Global Energy Institute showed that the prices of the commodity are expected to stay below $4 per million British thermal units for the rest of 2013 and should range from $3 to $4. Natural gas for delivery next month was traded at $3.932 yesterday completing a 12% decline from this year's highest level of $4.444 recorded on May 1.