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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $19,284 | 2,505 | 12,523,300 |
| 2006 | $11,609 | 1,741 | 8,702,950 |
| 2007 | $20,335 | 4,180 | 20,898,900 |
| 2008 | $67,275 | 9,705 | 48,524,300 |
| 2009 | $16,012 | 2,618 | 13,092,100 |
| 2010 | $28,085 | 3,332 | 16,660,550 |
| 2011 | $50,470 | 6,292 | 18,833,370 |
Note: Quantity represents Weight in carats
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