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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $717 | 111 | 83 |
| 2006 | $128,574 | 4,999 | 4,128 |
| 2007 | $211,131 | 10,898 | 4,718 |
| 2008 | $514,222 | 12,840 | 16,905 |
| 2009 | $533,499 | 11,023 | 10,179 |
| 2010 | $631,341 | 73,800 | 83,064 |
| 2011 | $374,602 | 47,489 | 65,924 |
Note: Quantity represents Number of pairs
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