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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 ... | $15,095,136 | $20,474,854 | $25,264,275 | $27,558,600 | $22,658,610 | $23,149,589 | $27,099,931 |
| Articles of asphalt/sim. mat. (e.g., petroleum bitumen/coal tar pitch), oth ... | $7,584,003 | $6,909,864 | $8,753,082 | $7,316,857 | $5,707,494 | $6,143,014 | $8,143,423 |
| Total | $22,679,139 | $27,384,718 | $34,017,357 | $34,875,457 | $28,366,104 | $29,292,603 | $35,243,354 |
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