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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Furnace burners for liquid fuel | $493 | $6,995 | $16,800 | $5,833 | $6,361 | $12,768 | $9,089 |
| Furnace burners other than those for liquid fuel, incl. combination burners ... | $216,103 | $184,726 | $898,145 | $1,030,038 | $741,196 | $497,612 | $3,193,205 |
| Mechanical stokers (incl. their mech. grates), mech. ash dischargers & sim. ... | $31,766 | $512 | $923 | $64,630 | $134,881 | $101,241 | $8,075 |
| Parts of the furnace burners, mech. stokers & mech. ash dischargers & sim. ... | $30,416 | $109,423 | $76,685 | $127,443 | $68,476 | $200,640 | $105,227 |
| Total | $278,778 | $301,656 | $992,553 | $1,227,944 | $950,914 | $812,261 | $3,315,596 |
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