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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 ... | $16,545,832 | $19,281,180 | $19,812,145 | $22,549,885 | $21,771,993 | $21,189,916 | $27,649,055 |
| Articles of asphalt/sim. mat. (e.g., petroleum bitumen/coal tar pitch), oth ... | $3,024,213 | $3,359,093 | $3,438,519 | $4,093,903 | $3,430,847 | $3,240,945 | $4,262,484 |
| Total | $19,570,045 | $22,640,273 | $23,250,664 | $26,643,788 | $25,202,840 | $24,430,861 | $31,911,539 |
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