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| Year | Trade Value | Weight (kg) | Quantity |
| 2007 | $105,649,651 | 0 | 27,543,368 |
| 2008 | $155,472,402 | 0 | 255,990 |
| 2009 | $208,684,517 | 0 | 158,474 |
| 2010 | $215,307,075 | 0 | 9,320,964 |
| 2011 | $228,427,788 | 0 | 15,247,392 |
Note: Quantity represents Electrical energy in thousands of kilowatt-hours
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