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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 ... | $12,826,663 | $17,957,170 | $22,102,777 | $37,434,125 | $32,683,913 | $28,824,380 | $34,206,632 |
| Articles of asphalt/sim. mat. (e.g., petroleum bitumen/coal tar pitch), oth ... | $3,135,403 | $3,289,242 | $4,746,338 | $5,735,334 | $7,185,821 | $11,258,961 | $7,200,978 |
| Total | $15,962,066 | $21,246,412 | $26,849,115 | $43,169,459 | $39,869,734 | $40,083,341 | $41,407,610 |
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