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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $4,031,872,295 | 11,865,458,094 | 11,865,458,094 |
| 2006 | $4,535,371,572 | 11,460,750,483 | 11,460,750,483 |
| 2007 | $5,544,601,251 | 12,221,027,086 | 12,221,027,086 |
| 2008 | $9,306,209,073 | 15,465,149,112 | 15,465,149,112 |
| 2009 | $8,053,481,495 | 20,433,737,563 | 20,433,737,563 |
| 2010 | $13,393,973,372 | 26,878,461,781 | 26,878,461,781 |
| 2011 | $23,020,133,004 | 33,908,296,042 | 33,908,296,042 |
Note: Quantity represents Weight in kilograms
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