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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $1,293,701,000 | 29,185,001,800 | 29,185,001,800 |
| 2006 | $1,621,108,000 | 30,600,438,976 | 30,600,438,976 |
| 2007 | $1,999,355,000 | 31,274,574,300 | 31,274,574,300 |
| 2008 | $2,722,948,000 | 31,035,513,800 | 31,035,513,800 |
| 2009 | $1,967,303,000 | 21,135,145,100 | 21,135,145,100 |
| 2010 | $3,465,588,775 | 29,701,966,029 | 29,701,966,029 |
| 2011 | $4,836,426,691 | 30,188,062,752 | 30,188,062,752 |
Note: Quantity represents Weight in kilograms
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