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| Year | Trade Value | Weight (kg) | Quantity |
| 2006 | $309,237,800 | 49,987,072 | 55,427,375 |
| 2007 | $285,017,142 | 45,217,861 | 41,312,008 |
| 2008 | $321,278,156 | 44,717,705 | 30,851,561 |
| 2009 | $299,090,606 | 41,328,453 | 28,027,136 |
| 2010 | $338,754,603 | 42,271,495 | 29,633,898 |
| 2011 | $354,690,604 | 40,129,033 | 37,018,911 |
Note: Quantity represents Number of pairs
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