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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $330,799,865 | 29,801,790 | 27,689,927 |
| 2006 | $390,003,388 | 21,513,822 | 27,153,947 |
| 2007 | $407,089,537 | 19,801,954 | 30,649,784 |
| 2008 | $406,663,235 | 19,006,582 | 25,854,915 |
| 2009 | $403,334,114 | 16,282,984 | 29,343,768 |
| 2010 | $531,802,808 | 21,368,864 | 38,534,508 |
| 2011 | $871,229,309 | 35,766,812 | 57,567,339 |
Note: Quantity represents Number of pairs
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