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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $195,000 | 67,747 | 15,744 |
| 2006 | $187,000 | 38,831 | 15,098 |
| 2007 | $276,000 | 90,103 | 31,411 |
| 2008 | $264,000 | 60,167 | 29,248 |
| 2009 | $985,000 | 160,800 | 92,923 |
| 2010 | $1,480,000 | 229,600 | 105,553 |
| 2011 | $1,194,000 | 192,962 | 140,402 |
Note: Quantity represents Number of pairs
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