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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Furnace burners for liquid fuel | $23,321 | $1,378 | | $33,907 | | $184,262 | $102,682 |
| Furnace burners other than those for liquid fuel, incl. combination burners ... | $882 | $7,392 | $60,718 | $96,981 | $564,117 | $406,397 | $798,987 |
| Mechanical stokers (incl. their mech. grates), mech. ash dischargers & sim. ... | $547 | | $551 | $48,422 | $695 | $71,556 | $226,166 |
| Parts of the furnace burners, mech. stokers & mech. ash dischargers & sim. ... | $103,250 | $109,037 | $313,758 | $275,409 | $188,579 | $329,947 | $314,013 |
| Total | $128,000 | $117,807 | $375,027 | $454,719 | $753,391 | $992,162 | $1,441,848 |
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