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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $728,742,827 | 880,247 | 17,452,960 |
| 2006 | $949,056,085 | 0 | 18,072,215 |
| 2007 | $1,348,879,146 | 0 | 21,866,836 |
| 2008 | $1,357,570,642 | 0 | 14,639,783 |
| 2009 | $1,814,225,816 | 0 | 25,970,706 |
| 2010 | $1,448,985,057 | 0 | 23,201,559 |
| 2011 | $2,159,000,356 | 0 | 29,826,214 |
Note: Quantity represents Electrical energy in thousands of kilowatt-hours
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