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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 ... | $43,249,824 | $43,339,437 | $55,768,333 | $65,693,865 | $64,642,783 | $69,748,092 | $74,149,565 |
| Articles of asphalt/sim. mat. (e.g., petroleum bitumen/coal tar pitch), oth ... | $7,504,411 | $9,413,372 | $12,177,412 | $10,587,462 | $9,050,612 | $8,484,354 | $12,352,612 |
| Total | $50,754,235 | $52,752,809 | $67,945,745 | $76,281,327 | $73,693,395 | $78,232,446 | $86,502,177 |
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