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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $544,686,176 | 34,235,442 | 78,009,610 |
| 2006 | $534,386,522 | 33,588,072 | 76,534,500 |
| 2007 | $289,134,312 | 17,200,482 | 43,755,876 |
| 2008 | $477,698,185 | 23,108,035 | 50,011,613 |
| 2009 | $455,994,870 | 18,791,136 | 42,292,227 |
| 2010 | $538,090,517 | 23,515,109 | 41,868,052 |
Note: Quantity represents Number of pairs
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