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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 ... | $11,978,196 | $13,954,144 | $10,953,569 | $13,920,870 | $8,565,883 | $9,937,390 | $24,263,275 |
| Articles of asphalt/sim. mat. (e.g., petroleum bitumen/coal tar pitch), oth ... | $11,769,477 | $20,533,729 | $42,895,570 | $57,193,750 | $23,055,133 | $33,951,807 | $34,337,885 |
| Total | $23,747,673 | $34,487,873 | $53,849,139 | $71,114,620 | $31,621,016 | $43,889,197 | $58,601,160 |
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