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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Producer gas/water gas generators, with/without their purifiers; acetylene ... | $6,346,536 | $36,230,986 | $40,513,211 | $33,734,528 | $33,239,348 | $15,421,137 | $8,509,855 |
| Parts of the producer gas/water gas generators/acetylene gas & sim. water p ... | $2,690,202 | $10,353,917 | $20,702,654 | $25,874,600 | $66,579,804 | $50,524,084 | $38,133,077 |
| Total | $9,036,738 | $46,584,903 | $61,215,865 | $59,609,128 | $99,819,152 | $65,945,221 | $46,642,932 |
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