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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $2,327,399,950 | 0 | 39,983,346 |
| 2006 | $3,155,573,642 | 0 | 45,687,671 |
| 2007 | $3,446,286,369 | 0 | 50,107,394 |
| 2008 | $5,068,084,350 | 0 | 51,114,380 |
| 2009 | $4,183,575,296 | 0 | 52,230,060 |
| 2010 | $4,863,745,366 | 0 | 66,108,146 |
| 2011 | $6,413,574,560 | 0 | 80,403,050 |
Note: Quantity represents Electrical energy in thousands of kilowatt-hours
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