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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $475,263,991 | 12,789,355,710 | 12,789,355,710 |
| 2006 | $740,022,663 | 22,575,557,948 | 22,575,557,948 |
| 2007 | $1,096,700,550 | 28,414,470,548 | 28,414,470,548 |
| 2008 | $1,323,860,241 | 19,387,245,067 | 19,387,245,067 |
| 2009 | $2,220,450,621 | 34,332,820,084 | 34,332,820,084 |
| 2010 | $2,200,934,176 | 26,299,889,142 | 26,299,889,142 |
| 2011 | $3,473,142,361 | 36,114,784,618 | 36,114,784,618 |
Note: Quantity represents Weight in kilograms
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