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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $3,528,377,364 | 4,000,073,144 | 4,000,073,144 |
| 2006 | $3,428,858,320 | 4,064,368,881 | 4,064,368,881 |
| 2007 | $4,846,204,011 | 4,800,348,989 | 4,800,348,989 |
| 2008 | $5,275,943,380 | 5,216,265,283 | 5,216,265,283 |
| 2009 | $3,515,447,133 | 5,828,090,324 | 5,828,090,324 |
| 2010 | $5,704,056,952 | 6,639,893,276 | 6,639,893,276 |
| 2011 | $8,495,757,096 | 7,269,174,129 | 7,269,174,129 |
Note: Quantity represents Weight in kilograms
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