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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 ... | $26,487,148 | $25,644,752 | $31,639,107 | $38,001,532 | $27,330,235 | $28,270,659 | $36,854,931 |
| Articles of asphalt/sim. mat. (e.g., petroleum bitumen/coal tar pitch), oth ... | $7,261,372 | $6,746,605 | $7,896,580 | $6,204,290 | $6,234,035 | $5,751,711 | $7,302,055 |
| Total | $33,748,520 | $32,391,357 | $39,535,687 | $44,205,822 | $33,564,270 | $34,022,370 | $44,156,986 |
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