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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 ... | $31,782,061 | $32,096,040 | $24,475,378 | $30,224,475 | $26,296,668 | $29,778,988 | $41,501,371 |
| Articles of asphalt/sim. mat. (e.g., petroleum bitumen/coal tar pitch), oth ... | $203,184 | $186,286 | $235,805 | $672,940 | $1,688,835 | $380,092 | $508,511 |
| Total | $31,985,245 | $32,282,326 | $24,711,183 | $30,897,415 | $27,985,503 | $30,159,080 | $42,009,882 |
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