2004 2005 2006 2007 2008 2009 2010 2011 2012 $0 $50,000,000 $100,000,000 $150,000,000 $200,000,000 $250,000,000 $300,000,000 $350,000,000
| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $196,801,235 | 27,576,960 | 27,576,960 |
| 2006 | $215,265,691 | 30,141,860 | 30,141,860 |
| 2007 | $237,618,872 | 35,003,664 | 35,003,664 |
| 2008 | $239,075,527 | 31,828,302 | 31,828,302 |
| 2009 | $212,292,287 | 28,556,439 | 28,556,439 |
| 2010 | $249,868,413 | 35,115,166 | 35,115,166 |
| 2011 | $274,437,917 | 51,207,068 | 51,207,068 |
Note: Quantity represents Weight in kilograms
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