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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Furnace burners for liquid fuel | $6,381 | $4,477 | $5,385 | $2,995 | $11,639 | $169,676 | $18,474 |
| Furnace burners other than those for liquid fuel, incl. combination burners ... | $175,259 | $54,307 | $92,404 | $68,630 | $336,371 | $730,789 | $1,480,948 |
| Mechanical stokers (incl. their mech. grates), mech. ash dischargers & sim. ... | $577 | $11,234 | $8,913 | $3,367 | $5,173 | $10,118 | $119,476 |
| Parts of the furnace burners, mech. stokers & mech. ash dischargers & sim. ... | $90,872 | $107,081 | $223,991 | $69,093 | $159,499 | $154,968 | $257,957 |
| Total | $273,089 | $177,099 | $330,693 | $144,085 | $512,682 | $1,065,551 | $1,876,855 |
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