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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $32,336 | 3,287 | 2,804 |
| 2006 | $46,697 | 4,734 | 4,272 |
| 2007 | $13,198 | 992 | 1,254 |
| 2008 | $302,814 | 4,603 | 5,873 |
| 2009 | $303,445 | 14,651 | 20,817 |
| 2010 | $1,081,231 | 167,298 | 136,157 |
| 2011 | $640,625 | 126,572 | 95,264 |
Note: Quantity represents Number of pairs
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