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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $5,636,248,818 | 21,640,903,842 | 21,640,903,842 |
| 2006 | $6,352,495,613 | 21,534,374,574 | 21,534,374,574 |
| 2007 | $7,843,501,396 | 22,903,628,511 | 22,903,628,511 |
| 2008 | $12,430,918,962 | 23,163,693,230 | 23,163,693,230 |
| 2009 | $8,862,822,312 | 22,185,229,305 | 22,185,229,305 |
| 2010 | $11,845,179,011 | 23,308,962,500 | 23,308,962,500 |
| 2011 | $16,329,105,277 | 24,848,233,496 | 24,848,233,496 |
Note: Quantity represents Weight in kilograms
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