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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $364 | 106 | 106 |
| 2006 | $2,395 | 659 | 659 |
| 2007 | $61,764 | 25,287 | 25,287 |
| 2008 | $218,155,865 | 243,054,766 | 243,054,766 |
| 2009 | $232,660,609 | 375,559,019 | 375,559,019 |
| 2010 | $594,177,736 | 768,831,721 | 768,831,721 |
| 2011 | $650,139,339 | 710,445,142 | 710,445,142 |
Note: Quantity represents Weight in kilograms
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