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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $183,627,266 | 24 | 2,858,300 |
| 2006 | $168,206,026 | 0 | 2,217,189 |
| 2007 | $216,658,687 | 0 | 3,799,481 |
| 2008 | $203,465,672 | 0 | 1,726,072 |
| 2009 | $250,752,658 | 0 | 4,353,963 |
| 2010 | $315,598,613 | 0 | 4,995,132 |
| 2011 | $164,369,412 | 0 | 2,143,101 |
Note: Quantity represents Electrical energy in thousands of kilowatt-hours
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