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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $590,093,195 | 23,197,356 | 37,681,558 |
| 2006 | $586,825,021 | 22,461,456 | 31,342,931 |
| 2007 | $592,244,179 | 21,743,872 | 32,628,876 |
| 2008 | $582,554,263 | 18,667,995 | 30,015,391 |
| 2009 | $521,699,556 | 16,636,230 | 20,507,762 |
| 2010 | $586,943,639 | 19,870,658 | 23,649,517 |
| 2011 | $694,156,345 | 20,367,115 | 24,331,249 |
Note: Quantity represents Number of pairs
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