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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Furnace burners for liquid fuel | $77,676,000 | $87,575,000 | $87,994,000 | $103,917,000 | $104,668,000 | $119,295,221 | $129,184,402 |
| Furnace burners other than those for liquid fuel, incl. combination burners ... | $185,169,000 | $240,056,000 | $261,941,000 | $309,915,000 | $211,808,000 | $193,319,925 | $253,747,373 |
| Mechanical stokers (incl. their mech. grates), mech. ash dischargers & sim. ... | $13,386,000 | $27,679,000 | $19,794,000 | $35,054,000 | $24,039,000 | $20,255,529 | $39,293,979 |
| Parts of the furnace burners, mech. stokers & mech. ash dischargers & sim. ... | $229,232,000 | $278,747,000 | $288,942,000 | $332,403,000 | $273,024,000 | $247,465,404 | $346,313,315 |
| Total | $505,463,000 | $634,057,000 | $658,671,000 | $781,289,000 | $613,539,000 | $580,336,079 | $768,539,069 |
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