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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $2,476,725,619 | 20,860,700 | 0 |
| 2006 | $1,761,263,679 | 17,092,397 | 263,853,174 |
| 2007 | $2,185,477,386 | 20,501,118 | 0 |
| 2008 | $2,331,141,192 | 17,681,628 | 0 |
| 2009 | $1,390,287,677 | 13,568,460 | 224,694,489 |
| 2010 | $1,114,069,790 | 17,326,870 | 149,359,171 |
| 2011 | $1,342,929,812 | 11,955,303 | 193,679,773 |
Note: Quantity represents No Quantity
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