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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $1,083,609,522 | 4,847,166,890 | 4,847,166,890 |
| 2006 | $1,213,576,373 | 4,958,301,420 | 4,958,301,420 |
| 2007 | $1,302,739,249 | 5,286,873,965 | 5,286,873,965 |
| 2008 | $1,640,865,279 | 5,360,486,458 | 5,360,486,458 |
| 2009 | $1,995,949,684 | 5,728,695,502 | 5,728,695,502 |
| 2010 | $2,033,793,510 | 5,156,474,884 | 5,156,474,884 |
| 2011 | $2,246,350,462 | 5,778,169,863 | 5,778,169,863 |
Note: Quantity represents Weight in kilograms
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