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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $1,236,946,040 | 21,566,676 | 21,566,676 |
| 2006 | $1,680,624,660 | 18,261,628 | 18,261,628 |
| 2007 | $3,568,868,401 | 16,195,662 | 16,195,662 |
| 2008 | $1,632,420,935 | 0 | 0 |
| 2009 | $1,338,003,012 | 14,365,479 | 14,365,479 |
| 2010 | $1,737,370,227 | 15,071,531 | 15,071,531 |
| 2011 | $2,444,717,999 | 19,183,442 | 19,183,442 |
Note: Quantity represents Weight in kilograms
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