'Source : US Energy Information Administration. .
| Date | Value | Change, % |
|---|---|---|
| 2012 | 26,697,100 | 5.63% |
| 2011 | 25,274,100 | 7.44% |
| 2010 | 23,524,100 | 5.76% |
| 2009 | 22,243,100 | 2.26% |
| 2008 | 21,751,280 | 2.28% |
| 2007 | 21,265,380 | 7.01% |
| 2006 | 19,872,160 | 8.50% |
| 2005 | 18,314,540 | 5.19% |
| 2004 | 17,410,620 | 6.42% |
| 2003 | 16,360,700 | 10.13% |
| 2002 | 14,856,420 | 3.52% |
| 2001 | 14,350,860 |
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