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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 ... | $24,831,956 | $22,866,036 | $30,228,495 | $39,903,585 | $36,475,505 | $37,301,559 | $28,365,602 |
| Articles of asphalt/sim. mat. (e.g., petroleum bitumen/coal tar pitch), oth ... | $14,747,123 | $20,540,762 | $23,691,158 | $28,532,662 | $18,677,735 | $20,049,157 | $22,752,591 |
| Total | $39,579,079 | $43,406,798 | $53,919,653 | $68,436,247 | $55,153,240 | $57,350,716 | $51,118,193 |
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