2004 2005 2006 2007 2008 2009 2010 2011 2012 $0 $10,000,000 $20,000,000 $30,000,000 $40,000,000
| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $13,216,933 | 109,537,339 | 109,537,339 |
| 2006 | $6,933,391 | 40,123,506 | 40,123,506 |
| 2007 | $9,514,967 | 38,090,397 | 38,090,397 |
| 2008 | $18,171,383 | 84,494,288 | 84,494,288 |
| 2009 | $28,214,070 | 216,483,588 | 216,483,588 |
| 2010 | $33,891,749 | 171,586,173 | 171,586,173 |
| 2011 | $29,045,810 | 131,544,548 | 131,544,548 |
Note: Quantity represents Weight in kilograms
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