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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 ... | $4,286,139 | $3,170,375 | $3,635,494 | $3,198,229 | $2,747,170 | $1,841,220 | $3,024,460 |
| Articles of asphalt/sim. mat. (e.g., petroleum bitumen/coal tar pitch), oth ... | $3,884,547 | $5,164,476 | $5,858,449 | $10,529,125 | $9,989,362 | $12,921,354 | $17,340,901 |
| Total | $8,170,686 | $8,334,851 | $9,493,943 | $13,727,354 | $12,736,532 | $14,762,574 | $20,365,361 |
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