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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $69,171,024 | 16,474 | 577,340 |
| 2006 | $70,974,731 | 155 | 788,171 |
| 2007 | $65,137,400 | 24,631 | 854,021 |
| 2008 | $50,407,964 | 6,936 | 526,381 |
| 2009 | $42,655,089 | 99 | 495,270 |
| 2010 | $49,850,788 | 93 | 462,450 |
| 2011 | $64,594,670 | 83 | 418,531 |
Note: Quantity represents Weight in carats
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