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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $13,200 | 1,294 | 842 |
| 2006 | $95,800 | 7,446 | 5,144 |
| 2007 | $229,200 | 14,237 | 11,493 |
| 2008 | $508,000 | 22,049 | 19,179 |
| 2009 | $396,300 | 20,726 | 17,925 |
| 2010 | $573,500 | 38,802 | 29,763 |
| 2011 | $402,600 | 26,393 | 21,438 |
Note: Quantity represents Number of pairs
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