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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Producer gas/water gas generators, with/without their purifiers; acetylene ... | $201,301 | $5,536,400 | $2,228,059 | $3,077,330 | $3,192,568 | $35,699,215 | $9,264,079 |
| Parts of the producer gas/water gas generators/acetylene gas & sim. water p ... | $64,181 | $54,375 | $134,800 | $98,676 | $145,718 | $150,430 | $156,695 |
| Total | $265,482 | $5,590,775 | $2,362,859 | $3,176,006 | $3,338,286 | $35,849,645 | $9,420,774 |
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