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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 ... | $23,528,668 | $24,794,977 | $26,644,228 | $31,002,680 | $21,580,004 | $19,110,075 | $13,949,737 |
| Articles of asphalt/sim. mat. (e.g., petroleum bitumen/coal tar pitch), oth ... | $9,746,842 | $13,095,895 | $22,825,832 | $35,252,179 | $22,744,913 | $24,095,099 | $20,546,339 |
| Total | $33,275,510 | $37,890,872 | $49,470,060 | $66,254,859 | $44,324,917 | $43,205,174 | $34,496,076 |
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