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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $9,393,772 | 500,297 | 803,347 |
| 2006 | $8,269,499 | 552,994 | 718,877 |
| 2007 | $11,245,659 | 778,922 | 878,161 |
| 2008 | $8,513,959 | 496,548 | 529,445 |
| 2009 | $10,837,288 | 554,173 | 714,464 |
| 2010 | $7,701,301 | 361,571 | 477,937 |
| 2011 | $10,707,133 | 458,091 | 609,143 |
Note: Quantity represents Number of pairs
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