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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $716,283,047 | 25,323,843 | 25,323,843 |
| 2006 | $724,857,269 | 25,626,981 | 25,626,981 |
| 2007 | $651,008,105 | 0 | 0 |
| 2008 | $642,711,103 | 15,655,123 | 15,655,123 |
| 2009 | $487,739,896 | 9,604,939 | 9,604,939 |
| 2010 | $528,256,868 | 12,506,018 | 12,506,018 |
| 2011 | $490,916,815 | 13,990,600 | 13,990,600 |
Note: Quantity represents Weight in kilograms
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