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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $1,260,649,960 | 2,597,998,616 | 2,597,998,616 |
| 2006 | $1,591,156,748 | 2,937,726,111 | 2,937,726,111 |
| 2007 | $1,769,189,245 | 2,964,043,080 | 2,964,043,080 |
| 2008 | $2,515,716,576 | 3,722,793,401 | 3,722,793,401 |
| 2009 | $2,630,135,476 | 5,931,314,844 | 5,931,314,844 |
| 2010 | $3,109,874,134 | 4,414,953,874 | 4,414,953,874 |
| 2011 | $3,604,659,611 | 5,257,952,258 | 5,257,952,258 |
Note: Quantity represents Weight in kilograms
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