| Years | Trade Value in 1000 USD | Revenue Effect in 1000 USD |
| 2010 | 25,900 | −138.76 |
| 2009 | 8980 | −62.76 |
| 2008 | 3220 | −130.73 |
| 2007 | 410 | 35.36 |
| 2006 | 390 | 67.06 |