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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Furnace burners for liquid fuel | $96,181,973 | $88,485,210 | $100,532,522 | $110,489,196 | $87,360,684 | $115,896,753 | $118,408,742 |
| Furnace burners other than those for liquid fuel, incl. combination burners ... | $88,325,864 | $112,213,503 | $145,722,298 | $146,138,110 | $135,152,992 | $139,975,565 | $168,037,212 |
| Mechanical stokers (incl. their mech. grates), mech. ash dischargers & sim. ... | $794,409 | $1,122,490 | $1,422,214 | $3,577,760 | $3,346,137 | $5,309,752 | $10,220,242 |
| Parts of the furnace burners, mech. stokers & mech. ash dischargers & sim. ... | $93,819,867 | $124,937,172 | $124,005,419 | $165,924,534 | $121,057,040 | $144,926,985 | $200,830,246 |
| Total | $279,122,113 | $326,758,375 | $371,682,453 | $426,129,600 | $346,916,853 | $406,109,055 | $497,496,442 |
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