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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $30,748 | 2,855 | 2,345 |
| 2006 | $25,495 | 4,573 | 1,944 |
| 2007 | $19,755 | 10,986 | 1,360 |
| 2008 | $20,783 | 2,289 | 1,050 |
| 2009 | $19,404 | 1,283 | 867 |
| 2010 | $22,252 | 1,093 | 1,003 |
| 2011 | $38,660 | 4,184 | 1,852 |
Note: Quantity represents Number of pairs
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