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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $3,777,043,100 | 2,001,732,207 | 2,001,732,207 |
| 2006 | $4,301,584,628 | 1,664,814,882 | 1,664,814,882 |
| 2007 | $4,016,650,501 | 1,460,116,756 | 1,460,116,756 |
| 2008 | $4,468,145,999 | 1,564,345,425 | 1,564,345,425 |
| 2009 | $3,494,680,582 | 2,104,073,939 | 2,104,073,939 |
| 2010 | $3,480,678,448 | 1,554,212,613 | 1,554,212,613 |
| 2011 | $3,457,653,689 | 1,341,343,151 | 1,341,343,151 |
Note: Quantity represents Weight in kilograms
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