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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $14,023,896,817 | 165,847,041 | 165,847,041 |
| 2006 | $16,027,073,869 | 145,823,097 | 145,823,097 |
| 2007 | $18,567,181,773 | 168,333,052 | 168,333,052 |
| 2008 | $20,444,859,191 | 143,810,597 | 143,810,597 |
| 2009 | $20,172,837,078 | 299,092,789 | 299,092,789 |
| 2010 | $20,782,880,056 | 187,561,661 | 187,561,661 |
| 2011 | $18,446,953,346 | 135,777,731 | 135,777,731 |
Note: Quantity represents Weight in kilograms
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