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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $3,083,192,528 | 7,836,687,900 | 7,836,687,900 |
| 2006 | $3,752,454,343 | 7,694,453,200 | 7,694,453,200 |
| 2007 | $4,187,467,861 | 7,641,959,600 | 7,641,959,600 |
| 2008 | $6,039,941,454 | 7,942,692,300 | 7,942,692,300 |
| 2009 | $3,406,917,299 | 7,425,055,700 | 7,425,055,700 |
| 2010 | $4,039,636,123 | 6,770,068,737 | 6,770,068,737 |
Note: Quantity represents Weight in kilograms
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