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| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $855,873,011 | 1,425,965,178 | 1,425,965,178 |
| 2006 | $906,521,063 | 1,408,382,256 | 1,408,382,256 |
| 2007 | $1,100,870,845 | 1,529,597,815 | 1,529,597,815 |
| 2008 | $789,576,577 | 1,205,908,706 | 1,205,908,706 |
| 2009 | $630,797,378 | 995,056,146 | 995,056,146 |
| 2010 | $459,717,086 | 805,619,529 | 805,619,529 |
| 2011 | $501,541,092 | 727,448,488 | 727,448,488 |
Note: Quantity represents Weight in kilograms
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