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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Furnace burners for liquid fuel | $23,391 | $15,103 | $12,088 | $73,370 | $14,874 | $23,485 | $78,544 |
| Furnace burners other than those for liquid fuel, incl. combination burners ... | $10,149 | $32,055 | $7,643 | $74,301 | $42,578 | $30,060 | $52,420 |
| Mechanical stokers (incl. their mech. grates), mech. ash dischargers & sim. ... | $1,183 | $3,362 | $1,729 | $11,231 | $1,527 | $16,554 | $113,862 |
| Parts of the furnace burners, mech. stokers & mech. ash dischargers & sim. ... | $13,218 | $7,979 | $95,769 | $20,601 | $59,278 | $51,903 | $31,162 |
| Total | $47,941 | $58,499 | $117,229 | $179,503 | $118,257 | $122,002 | $275,988 |
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