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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 ... | $8,810,309 | $11,636,588 | $10,942,045 | $13,135,234 | $7,857,823 | $9,362,757 | $30,850,322 |
| Articles of asphalt/sim. mat. (e.g., petroleum bitumen/coal tar pitch), oth ... | $21,846,363 | $25,268,447 | $27,798,207 | $33,369,820 | $24,389,174 | $32,294,432 | $28,704,235 |
| Total | $30,656,672 | $36,905,035 | $38,740,252 | $46,505,054 | $32,246,997 | $41,657,189 | $59,554,557 |
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