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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Producer gas/water gas generators, with/without their purifiers; acetylene ... | $34,100,172 | $17,354,307 | $13,120,425 | $8,436,925 | $4,647,601 | $7,814,298 | $5,551,743 |
| Parts of the producer gas/water gas generators/acetylene gas & sim. water p ... | $7,863,660 | $4,966,243 | $4,884,753 | $2,931,308 | $2,202,353 | $2,672,982 | $10,500,024 |
| Total | $41,963,832 | $22,320,550 | $18,005,178 | $11,368,233 | $6,849,954 | $10,487,280 | $16,051,767 |
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