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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $6,719,588,861 | 62,270,895 | 62,270,895 |
| 2006 | $7,916,516,982 | 46,250,789 | 46,250,789 |
| 2007 | $5,338,609,168 | 30,788,852 | 30,788,852 |
| 2008 | $4,212,459,938 | 37,991,240 | 37,991,240 |
| 2009 | $3,272,044,756 | 28,310,118 | 28,310,118 |
| 2010 | $3,235,906,701 | 26,484,167 | 26,484,167 |
| 2011 | $2,258,865,137 | 23,041,344 | 23,041,344 |
Note: Quantity represents Weight in kilograms
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