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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $1,482,664,590 | 927,244,897 | 927,244,897 |
| 2006 | $1,542,604,474 | 898,327,843 | 898,327,843 |
| 2007 | $1,156,999,490 | 656,889,399 | 656,889,399 |
| 2008 | $862,024,156 | 430,408,000 | 430,408,000 |
| 2009 | $578,778,908 | 261,394,964 | 261,394,964 |
| 2010 | $654,888,841 | 337,354,768 | 337,354,768 |
| 2011 | $631,044,992 | 326,716,897 | 326,716,897 |
Note: Quantity represents Weight in kilograms
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