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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $1,490,311,084 | 21,440,775 | 21,440,775 |
| 2006 | $2,174,158,257 | 30,671,997 | 30,671,997 |
| 2007 | $854,306,112 | 39,059,174 | 39,059,174 |
| 2008 | $1,631,920,761 | 69,291,952 | 69,291,952 |
| 2009 | $1,115,398,372 | 52,188,632 | 52,188,632 |
| 2010 | $2,949,390,839 | 121,008,788 | 121,008,788 |
| 2011 | $3,340,433,076 | 126,018,415 | 126,018,415 |
Note: Quantity represents Weight in kilograms
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