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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Furnace burners for liquid fuel | $446,877 | $1,423,265 | $979,949 | $4,271,316 | $2,816,741 | $803,571 | $755,780 |
| Furnace burners other than those for liquid fuel, incl. combination burners ... | $3,810,575 | $2,767,224 | $3,172,520 | $3,669,460 | $2,406,783 | $4,556,299 | $4,276,398 |
| Mechanical stokers (incl. their mech. grates), mech. ash dischargers & sim. ... | $573,572 | $61,569 | $126,695 | $123,514 | $1,253,381 | $166,662 | $331,932 |
| Parts of the furnace burners, mech. stokers & mech. ash dischargers & sim. ... | $3,782,169 | $4,502,825 | $11,269,849 | $4,213,122 | $3,617,559 | $2,666,648 | $6,230,051 |
| Total | $8,613,193 | $8,754,883 | $15,549,013 | $12,277,412 | $10,094,464 | $8,193,180 | $11,594,161 |
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