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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $20,978,368 | 0 | 3,774,461 |
| 2006 | $19,003,692 | 0 | 3,079,151 |
| 2007 | $33,324,840 | 0 | 2,124,455 |
| 2008 | $34,482,095 | 0 | 2,590,804 |
| 2009 | $32,977,612 | 0 | 3,652,978 |
| 2010 | $56,614,813 | 0 | 6,108,009 |
| 2011 | $45,388,992 | 0 | 5,458,028 |
Note: Quantity represents Weight in carats
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