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| Year | Trade Value | Weight (kg) | Quantity |
| 2006 | $172 | 1 | 1 |
| 2007 | $37,759,185 | 727,913,561 | 727,913,561 |
| 2008 | $40,303,786 | 985,988,146 | 985,988,146 |
| 2009 | $86,056,872 | 2,222,306,619 | 2,222,306,619 |
| 2010 | $197,301,898 | 4,194,871,137 | 4,194,871,137 |
| 2011 | $163,844,601 | 2,410,576,156 | 2,410,576,156 |
Note: Quantity represents Weight in kilograms
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