'Source : US Energy Information Administration. .
| Date | Value | Change, % |
|---|---|---|
| 2012 | 976,000 | 10.41% |
| 2011 | 884,000 | 19.14% |
| 2010 | 742,000 | -2.88% |
| 2009 | 764,000 | 20.30% |
| 2008 | 635,100 | 6.05% |
| 2007 | 598,860 | -2.75% |
| 2006 | 615,800 | 1.30% |
| 2005 | 607,900 | 4.47% |
| 2004 | 581,900 | 35.33% |
| 2003 | 430,000 | -24.56% |
| 2002 | 570,000 | 19.75% |
| 2001 | 476,000 |
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