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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $1,260,341,555 | 3,226,383,113 | 3,226,383,113 |
| 2006 | $1,528,803,141 | 3,209,068,424 | 3,209,068,424 |
| 2007 | $1,960,377,380 | 3,595,536,683 | 3,595,536,683 |
| 2008 | $2,106,530,819 | 2,878,397,156 | 2,878,397,156 |
| 2009 | $1,317,372,170 | 2,792,966,894 | 2,792,966,894 |
| 2010 | $1,814,879,159 | 2,931,402,276 | 2,931,402,276 |
| 2011 | $2,180,613,298 | 2,471,234,311 | 2,471,234,311 |
Note: Quantity represents Weight in kilograms
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