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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 |
| Articles of asphalt/sim. mat. (e.g., petroleum bitumen/coal tar pitch), in ... | $11,060,826 | $14,937,692 | $18,837,129 | $16,082,823 | $9,287,647 | $7,075,482 |
| Articles of asphalt/sim. mat. (e.g., petroleum bitumen/coal tar pitch), oth ... | $7,853,794 | $6,743,343 | $8,145,326 | $7,776,709 | $5,371,346 | $4,740,029 |
| Total | $18,914,620 | $21,681,035 | $26,982,455 | $23,859,532 | $14,658,993 | $11,815,511 |
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