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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $413,414,142 | 9,243,018,418 | 9,243,018,418 |
| 2006 | $455,686,470 | 10,122,473,068 | 10,122,473,068 |
| 2007 | $469,539,882 | 9,792,839,748 | 9,792,839,748 |
| 2008 | $1,543,237,687 | 8,017,591,379 | 8,017,591,379 |
| 2009 | $1,037,828,128 | 9,224,263,880 | 9,224,263,880 |
| 2010 | $1,591,991,185 | 19,769,765,399 | 19,769,765,399 |
| 2011 | $2,356,751,630 | 21,677,563,492 | 21,677,563,492 |
Note: Quantity represents Weight in kilograms
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