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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 ... | $13,833,904 | $18,429,377 | $20,306,126 | $27,237,340 | $16,916,716 | $13,806,608 | $12,640,386 |
| Articles of asphalt/sim. mat. (e.g., petroleum bitumen/coal tar pitch), oth ... | $3,121,001 | $3,966,126 | $9,785,323 | $11,267,737 | $5,662,740 | $5,192,032 | $4,777,172 |
| Total | $16,954,905 | $22,395,503 | $30,091,449 | $38,505,077 | $22,579,456 | $18,998,640 | $17,417,558 |
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