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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $507,833,021 | 16,067,225 | 61,028,467 |
| 2006 | $591,941,995 | 18,728,332 | 59,455,663 |
| 2007 | $661,145,354 | 18,424,342 | 60,425,095 |
| 2008 | $780,935,172 | 17,697,761 | 56,282,572 |
| 2009 | $770,059,988 | 63,294,054 | 16,538,422 |
| 2010 | $1,225,448,278 | 90,058,352 | 76,172,888 |
| 2011 | $1,519,813,618 | 95,872,183 | 83,566,932 |
Note: Quantity represents Number of pairs
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