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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 |
| Articles of asphalt/sim. mat. (e.g., petroleum bitumen/coal tar pitch), in ... | $23,273,249 | $24,654,858 | $27,133,482 | $35,182,523 | $27,767,717 | $29,311,913 |
| Articles of asphalt/sim. mat. (e.g., petroleum bitumen/coal tar pitch), oth ... | $4,837,822 | $4,498,947 | $3,970,757 | $4,649,654 | $2,810,233 | $2,072,568 |
| Total | $28,111,071 | $29,153,805 | $31,104,239 | $39,832,177 | $30,577,950 | $31,384,481 |
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