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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $3,160,756,294 | 60,553,354 | 60,553,354 |
| 2006 | $2,845,108,632 | 48,829,839 | 48,829,839 |
| 2007 | $2,342,846,342 | 40,610,796 | 40,610,796 |
| 2008 | $2,691,094,024 | 31,364,289 | 31,364,289 |
| 2009 | $2,250,279,049 | 23,265,596 | 23,265,596 |
| 2010 | $2,174,743,252 | 23,675,117 | 23,675,117 |
| 2011 | $1,810,548,500 | 20,374,828 | 20,374,828 |
Note: Quantity represents Weight in kilograms
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