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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $14,400,367 | 40 | 200,220 |
| 2006 | $3,666,408 | 11 | 0 |
| 2007 | $2,178,667 | 4 | 22,285 |
| 2008 | $4,230,111 | 6 | 28,935 |
| 2009 | $3,812,083 | 11 | 50,685 |
| 2010 | $6,133,628 | 16 | 77,055 |
| 2011 | $3,438,273 | 24 | 122,135 |
Note: Quantity represents Weight in carats
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