| 年份 | 分类 | 数值(Dollars per Thousand Cubic Feet) |
| 2000 | U.S. Natural Gas Wellhead Price | 3.68 |
| 2001 | U.S. Natural Gas Wellhead Price | 4.00 |
| 2002 | U.S. Natural Gas Wellhead Price | 2.95 |
| 2003 | U.S. Natural Gas Wellhead Price | 4.88 |
| 2004 | U.S. Natural Gas Wellhead Price | 5.46 |
| 2005 | U.S. Natural Gas Wellhead Price | 7.33 |
| 2006 | U.S. Natural Gas Wellhead Price | 6.39 |
| 2007 | U.S. Natural Gas Wellhead Price | 6.25 |
| 2008 | U.S. Natural Gas Wellhead Price | 7.97 |
| 2009 | U.S. Natural Gas Wellhead Price | 3.67 |
| 2010 | U.S. Natural Gas Wellhead Price | 4.48 |
| 2011 | U.S. Natural Gas Wellhead Price | 3.95 |
| 2012 | U.S. Natural Gas Wellhead Price | 2.66 |
| 2013 | U.S. Natural Gas Wellhead Price | NA |
| 2014 | U.S. Natural Gas Wellhead Price | NA |
| 2015 | U.S. Natural Gas Wellhead Price | NA |
| 2016 | U.S. Natural Gas Wellhead Price | 0.00 |