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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $2,706,246,664 | 0 | 51,287,286 |
| 2006 | $2,735,052,033 | 0 | 39,867,119 |
| 2007 | $2,974,572,977 | 0 | 36,503,714 |
| 2008 | $3,352,869,871 | 0 | 31,692,083 |
| 2009 | $4,008,134,200 | 0 | 44,381,994 |
| 2010 | $3,524,296,624 | 0 | 48,330,310 |
| 2011 | $4,148,365,971 | 0 | 48,501,912 |
Note: Quantity represents Electrical energy in thousands of kilowatt-hours
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