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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $469,152,573 | 25,907 | 25,907 |
| 2006 | $582,809,690 | 27,697 | 27,697 |
| 2007 | $842,840,845 | 30,530 | 30,530 |
| 2008 | $823,118,807 | 26,861 | 26,861 |
| 2009 | $589,935,981 | 17,087 | 17,087 |
| 2010 | $924,395,939 | 28,070 | 28,070 |
| 2011 | $1,332,919,490 | 26,952 | 26,952 |
Note: Quantity represents Weight in kilograms
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