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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $102,790 | 1,602 | 2,247 |
| 2006 | $77,587 | 2,753 | 3,282 |
| 2007 | $117,113 | 1,084 | 1,289 |
| 2008 | $110,942 | 674 | 1,290 |
| 2009 | $514,286 | 6,760 | 9,655 |
| 2010 | $533,689 | 5,877 | 6,705 |
| 2011 | $803,071 | 6,598 | 9,794 |
Note: Quantity represents Number of pairs
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