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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $1,105,078,832 | 4,352,686,343 | 4,352,686,343 |
| 2006 | $1,460,550,544 | 4,468,488,592 | 4,468,488,592 |
| 2007 | $1,485,743,584 | 4,148,961,586 | 4,148,961,586 |
| 2008 | $1,685,251,674 | 4,782,941,625 | 4,782,941,625 |
| 2009 | $1,128,212,728 | 4,113,563,304 | 4,113,563,304 |
| 2010 | $1,343,147,905 | 4,348,646,605 | 4,348,646,605 |
| 2011 | $1,538,609,468 | 4,155,595,223 | 4,155,595,223 |
Note: Quantity represents Weight in kilograms
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