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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $1,824,985,789 | 28,831,508,176 | 28,831,508,176 |
| 2006 | $2,092,307,140 | 30,952,116,912 | 30,952,116,912 |
| 2007 | $1,444,607,026 | 19,885,008,120 | 19,885,008,120 |
| 2008 | $759,149,544 | 9,731,314,968 | 9,731,314,968 |
| 2009 | $435,693,156 | 5,521,160,984 | 5,521,160,984 |
| 2010 | $406,918,358 | 5,389,979,976 | 5,389,979,976 |
| 2011 | $381,250,196 | 5,104,536,000 | 5,104,536,000 |
Note: Quantity represents Weight in kilograms
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