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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $883,066,000 | 978,095 | 978,095 |
| 2006 | $955,291,000 | 937,526 | 937,526 |
| 2007 | $806,725,000 | 672,779 | 672,779 |
| 2008 | $706,564,000 | 596,490 | 596,490 |
| 2009 | $816,837,000 | 778,152 | 778,152 |
| 2010 | $796,328,631 | 1,000,947 | 1,000,947 |
| 2011 | $1,024,469,535 | 1,344,754 | 1,344,754 |
Note: Quantity represents Weight in kilograms
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