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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 ... | $32,306,391 | $35,782,669 | $40,663,520 | $49,800,799 | $25,659,846 | $26,817,214 | $37,860,937 |
| Articles of asphalt/sim. mat. (e.g., petroleum bitumen/coal tar pitch), oth ... | $7,871,917 | $7,475,437 | $9,049,846 | $12,790,283 | $8,035,293 | $7,116,722 | $4,598,260 |
| Total | $40,178,308 | $43,258,106 | $49,713,366 | $62,591,082 | $33,695,139 | $33,933,936 | $42,459,197 |
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