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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 ... | $18,746,565 | $18,155,870 | $21,871,516 | $24,231,919 | $12,269,790 | $12,105,938 | $17,704,331 |
| Articles of asphalt/sim. mat. (e.g., petroleum bitumen/coal tar pitch), oth ... | $2,812,429 | $1,732,109 | $1,236,557 | $1,132,341 | $857,336 | $824,110 | $1,379,415 |
| Total | $21,558,994 | $19,887,979 | $23,108,073 | $25,364,260 | $13,127,126 | $12,930,048 | $19,083,746 |
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