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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $12,638,969,085 | 164,819,081,216 | 164,819,081,216 |
| 2006 | $12,769,179,153 | 160,239,591,072 | 160,239,591,072 |
| 2007 | $13,627,566,191 | 169,381,670,840 | 169,381,670,840 |
| 2008 | $26,663,665,806 | 168,804,882,280 | 168,804,882,280 |
| 2009 | $20,298,894,590 | 144,179,527,384 | 144,179,527,384 |
| 2010 | $21,683,201,935 | 163,505,582,880 | 163,505,582,880 |
| 2011 | $28,173,163,881 | 157,620,448,672 | 157,620,448,672 |
Note: Quantity represents Weight in kilograms
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