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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $16,207,589 | 36 | 207,710 |
| 2006 | $13,298,033 | 59 | 0 |
| 2007 | $14,431,357 | 63 | 327,410 |
| 2008 | $19,597,638 | 46 | 236,795 |
| 2009 | $18,424,673 | 39 | 192,620 |
| 2010 | $19,934,690 | 33 | 161,720 |
| 2011 | $17,137,024 | 30 | 159,660 |
Note: Quantity represents Weight in carats
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