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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Furnace burners for liquid fuel | $8,827,202 | $10,099,014 | $10,111,161 | $11,187,301 | $8,125,966 | $5,982,622 | $5,399,883 |
| Furnace burners other than those for liquid fuel, incl. combination burners ... | $3,725,319 | $5,075,540 | $5,945,582 | $5,851,822 | $7,376,807 | $3,954,131 | $2,843,778 |
| Mechanical stokers (incl. their mech. grates), mech. ash dischargers & sim. ... | $957,691 | $1,447,332 | $1,287,913 | $763,822 | $227,747 | $97,704 | $231,746 |
| Parts of the furnace burners, mech. stokers & mech. ash dischargers & sim. ... | $9,819,367 | $12,501,280 | $12,243,783 | $13,921,247 | $10,285,719 | $13,159,571 | $17,516,579 |
| Total | $23,329,579 | $29,123,166 | $29,588,439 | $31,724,192 | $26,016,239 | $23,194,028 | $25,991,986 |
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