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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $3,113,676,092 | 113,087,685 | 260,233,808 |
| 2006 | $3,112,585,974 | 113,048,092 | 241,224,462 |
| 2007 | $3,093,833,151 | 98,578,525 | 227,259,161 |
| 2008 | $3,233,893,390 | 81,198,303 | 206,448,971 |
| 2009 | $2,547,003,288 | 53,873,765 | 156,741,347 |
| 2010 | $2,966,074,243 | 63,810,315 | 173,163,917 |
| 2011 | $2,916,890,130 | 67,892,410 | 146,751,655 |
Note: Quantity represents Number of pairs
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