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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 ... | $27,318,285 | $35,692,688 | $38,050,713 | $31,991,469 | $30,049,368 | $24,176,379 | $19,879,796 |
| Articles of asphalt/sim. mat. (e.g., petroleum bitumen/coal tar pitch), oth ... | $5,788,709 | $5,729,535 | $6,381,000 | $8,035,960 | $4,475,179 | $2,444,208 | $9,087,584 |
| Total | $33,106,994 | $41,422,223 | $44,431,713 | $40,027,429 | $34,524,547 | $26,620,587 | $28,967,380 |
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