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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $400,400 | 14,665 | 14,265 |
| 2006 | $377,600 | 8,566 | 8,488 |
| 2007 | $769,400 | 17,621 | 12,255 |
| 2008 | $1,272,300 | 20,104 | 22,409 |
| 2009 | $562,200 | 6,994 | 5,996 |
| 2010 | $3,742,400 | 135,973 | 145,361 |
| 2011 | $431,000 | 11,482 | 8,942 |
Note: Quantity represents Number of pairs
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