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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $1,535,038,536 | 16,606,841,576 | 16,606,841,576 |
| 2006 | $1,922,824,294 | 19,890,800,875 | 19,890,800,875 |
| 2007 | $2,478,666,416 | 22,333,467,525 | 22,333,467,525 |
| 2008 | $3,151,842,864 | 18,781,879,376 | 18,781,879,376 |
| 2009 | $3,002,554,439 | 19,906,396,722 | 19,906,396,722 |
| 2010 | $3,072,192,629 | 21,101,947,384 | 21,101,947,384 |
| 2011 | $1,108,647,233 | 4,143,013,274 | 4,143,013,274 |
Note: Quantity represents Weight in kilograms
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