Source: Quarterly financial reports with the Securities and Exchange Commission, or if necessary, statements signed by company officials and provided to NGI.

* Merrill Lynch's 2Q2004 number is an estimate based on what EntergyKoch (which was purchased by Merrill Lynch earlier this year) traded at the time. BP's 2Q2005 number is an estimate based on the U.S. gas sales BP reported and the average of its Canadian gas sales in 4Q2004. ** The total excludes Constellation because no number was provided for 2Q2004. BP, Constellation, ConocoPhillips, Coral, Chevron, Tenaska, Louis Dreyfus, UBS, Calpine and Merrill Lynch did not report North American gas sales volumes to the SEC. Data for those companies, except for BP, were obtained directly from company officials, or, in BP's case, were estimated based on previous information.

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