2004 2005 2006 2007 2008 2009 2010 2011 2012 $0 $1,000,000 $2,000,000 $3,000,000 $4,000,000 $5,000,000
| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $3,218,957 | 150,348 | 207,233 |
| 2006 | $3,253,936 | 115,734 | 208,055 |
| 2007 | $4,391,645 | 174,259 | 294,662 |
| 2008 | $3,935,620 | 147,197 | 259,758 |
| 2009 | $2,449,408 | 84,882 | 149,060 |
| 2010 | $3,224,973 | 97,043 | 230,359 |
| 2011 | $4,127,060 | 79,246 | 218,974 |
Note: Quantity represents Number of pairs
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