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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $331,500 | 46,312 | 111,058 |
| 2006 | $733,500 | 82,239 | 162,854 |
| 2007 | $1,421,800 | 120,711 | 209,579 |
| 2008 | $2,301,800 | 178,199 | 331,314 |
| 2009 | $4,599,400 | 279,639 | 473,477 |
| 2010 | $7,777,700 | 519,801 | 886,436 |
| 2011 | $10,348,300 | 569,552 | 1,055,718 |
Note: Quantity represents Number of pairs
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