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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 ... | $7,604,944 | $11,013,605 | $16,692,254 | $16,736,468 | $13,227,667 | $17,133,262 | $15,008,815 |
| Articles of asphalt/sim. mat. (e.g., petroleum bitumen/coal tar pitch), oth ... | $3,225,883 | $3,222,400 | $4,345,971 | $2,772,400 | $1,970,851 | $2,310,957 | $2,515,350 |
| Total | $10,830,827 | $14,236,005 | $21,038,225 | $19,508,868 | $15,198,518 | $19,444,219 | $17,524,165 |
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