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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $1,069,993,849 | 1,308,243,109 | 1,308,243,109 |
| 2006 | $939,220,092 | 1,146,679,273 | 1,146,679,273 |
| 2007 | $921,517,936 | 1,013,909,242 | 1,013,909,242 |
| 2008 | $888,512,848 | 860,773,296 | 860,773,296 |
| 2009 | $1,300,728,098 | 1,716,494,649 | 1,716,494,649 |
| 2010 | $1,298,093,766 | 1,300,231,351 | 1,300,231,351 |
| 2011 | $1,284,888,175 | 1,148,691,410 | 1,148,691,410 |
Note: Quantity represents Weight in kilograms
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