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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $407,484,000 | 26,196,800 | 26,196,800 |
| 2006 | $453,467,000 | 29,808,701 | 29,808,701 |
| 2007 | $603,132,000 | 36,121,677 | 36,121,677 |
| 2008 | $639,754,000 | 35,273,535 | 35,273,535 |
| 2009 | $574,164,000 | 32,181,639 | 32,181,639 |
| 2010 | $530,006,648 | 32,003,880 | 32,003,880 |
| 2011 | $495,537,825 | 27,842,307 | 27,842,307 |
Note: Quantity represents Weight in kilograms
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