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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $2,164,814,326 | 2,610,739,987 | 2,610,739,987 |
| 2006 | $2,470,914,378 | 2,498,248,616 | 2,498,248,616 |
| 2007 | $3,046,211,496 | 2,675,248,170 | 2,675,248,170 |
| 2008 | $2,721,622,323 | 1,903,012,508 | 1,903,012,508 |
| 2009 | $1,348,753,901 | 1,539,081,680 | 1,539,081,680 |
| 2010 | $1,801,726,889 | 1,638,839,189 | 1,638,839,189 |
| 2011 | $2,122,627,600 | 1,483,814,720 | 1,483,814,720 |
Note: Quantity represents Weight in kilograms
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