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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Furnace burners for liquid fuel | $7,266,978 | $6,858,441 | $12,181,479 | $14,658,531 | $10,033,692 | $10,262,723 | $12,728,450 |
| Furnace burners other than those for liquid fuel, incl. combination burners ... | $13,048,649 | $14,714,435 | $32,480,389 | $21,033,409 | $11,706,585 | $14,521,752 | $19,368,462 |
| Mechanical stokers (incl. their mech. grates), mech. ash dischargers & sim. ... | $4,390,676 | $8,290,639 | $7,423,644 | $6,686,307 | $6,523,013 | $3,768,328 | $4,071,240 |
| Parts of the furnace burners, mech. stokers & mech. ash dischargers & sim. ... | $2,227,365 | $3,104,601 | $4,486,427 | $3,008,025 | $3,627,900 | $3,274,367 | $4,155,656 |
| Total | $26,933,668 | $32,968,116 | $56,571,939 | $45,386,272 | $31,891,190 | $31,827,170 | $40,323,808 |
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