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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $19,432,000 | 310,477 | 1,120,098 |
| 2006 | $30,280,000 | 457,005 | 1,745,397 |
| 2007 | $32,436,000 | 350,730 | 766,187 |
| 2008 | $32,500,000 | 341,378 | 541,862 |
| 2009 | $22,656,000 | 280,091 | 310,705 |
| 2010 | $23,122,865 | 354,160 | 329,653 |
| 2011 | $41,845,905 | 884,640 | 640,779 |
Note: Quantity represents Number of pairs
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