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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $135,889,360 | 3,402,268,104 | 3,402,268,104 |
| 2006 | $131,880,204 | 3,178,375,238 | 3,178,375,238 |
| 2007 | $121,525,853 | 2,917,197,311 | 2,917,197,311 |
| 2008 | $88,788,153 | 1,985,603,761 | 1,985,603,761 |
| 2009 | $35,999,356 | 831,372,596 | 831,372,596 |
| 2010 | $35,086,450 | 776,044,407 | 776,044,407 |
| 2011 | $30,698,040 | 684,988,663 | 684,988,663 |
Note: Quantity represents Weight in kilograms
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