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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $1,164,103,685 | 970,028,045 | 970,028,045 |
| 2006 | $1,461,951,197 | 1,077,868,385 | 1,077,868,385 |
| 2007 | $2,054,849,802 | 1,532,052,689 | 1,532,052,689 |
| 2008 | $2,583,874,567 | 1,805,694,709 | 1,805,694,709 |
| 2009 | $2,346,893,563 | 2,163,706,064 | 2,163,706,064 |
| 2010 | $2,327,844,984 | 1,745,425,235 | 1,745,425,235 |
| 2011 | $2,577,625,144 | 1,725,198,298 | 1,725,198,298 |
Note: Quantity represents Weight in kilograms
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