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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $449,150,137 | 713,082,045 | 713,082,045 |
| 2006 | $680,979,918 | 1,068,610,060 | 1,068,610,060 |
| 2007 | $352,062,901 | 466,161,318 | 466,161,318 |
| 2008 | $102,228,706 | 77,207,533 | 77,207,533 |
| 2009 | $437,749,012 | 547,067,778 | 547,067,778 |
| 2010 | $184,133,547 | 92,271,952 | 92,271,952 |
| 2011 | $409,891,787 | 398,687,965 | 398,687,965 |
Note: Quantity represents Weight in kilograms
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