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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $39,571,023 | 0 | 16,711 |
| 2006 | $37,225,591 | 0 | 48,309 |
| 2007 | $31,726,616 | 13 | 116,003 |
| 2008 | $22,734,866 | 12 | 72,654 |
| 2009 | $12,336,826 | 0 | 35,643 |
| 2010 | $21,942,034 | 0 | 59,657 |
| 2011 | $32,983,764 | 0 | 88,855 |
Note: Quantity represents Weight in carats
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