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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $1,136,378,328 | 343,650,143 | 343,650,143 |
| 2006 | $1,275,316,380 | 381,895,681 | 381,895,681 |
| 2007 | $1,620,633,847 | 431,490,680 | 431,490,680 |
| 2008 | $1,859,227,706 | 405,474,090 | 405,474,090 |
| 2009 | $1,456,687,033 | 308,803,899 | 308,803,899 |
| 2010 | $1,488,622,764 | 356,003,983 | 356,003,983 |
| 2011 | $1,772,550,973 | 403,894,363 | 403,894,363 |
Note: Quantity represents Weight in kilograms
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