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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $441,722,994 | 711,520,846 | 711,520,846 |
| 2006 | $573,751,892 | 844,551,078 | 844,551,078 |
| 2007 | $772,095,076 | 1,047,356,917 | 1,047,356,917 |
| 2008 | $1,025,366,917 | 817,233,689 | 817,233,689 |
| 2009 | $501,737,713 | 635,804,566 | 635,804,566 |
| 2010 | $625,022,970 | 764,719,920 | 764,719,920 |
| 2011 | $812,307,563 | 1,077,901,165 | 1,077,901,165 |
Note: Quantity represents Weight in kilograms
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