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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Articles of asphalt/sim. mat. (e.g., petroleum bitumen/coal tar pitch), in ... | $11,629,098 | $19,822,015 | $21,812,786 | $19,654,768 | $12,157,455 | $11,287,338 | $7,478,012 |
| Articles of asphalt/sim. mat. (e.g., petroleum bitumen/coal tar pitch), oth ... | $401,906 | $468,164 | $544,226 | $706,553 | $284,818 | $439,214 | $590,947 |
| Total | $12,031,004 | $20,290,179 | $22,357,012 | $20,361,321 | $12,442,273 | $11,726,552 | $8,068,959 |
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