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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 ... | $37,807,980 | $45,942,992 | $59,547,474 | $70,786,735 | $34,734,893 | $38,765,189 | $41,720,513 |
| Articles of asphalt/sim. mat. (e.g., petroleum bitumen/coal tar pitch), oth ... | $10,651,167 | $12,149,807 | $15,796,892 | $18,369,842 | $11,150,752 | $11,670,696 | $16,066,782 |
| Total | $48,459,147 | $58,092,799 | $75,344,366 | $89,156,577 | $45,885,645 | $50,435,885 | $57,787,295 |
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