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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 ... | $2,965,273 | $3,543,119 | $6,585,756 | $4,298,657 | $4,315,979 | $5,596,278 | $6,746,750 |
| Articles of asphalt/sim. mat. (e.g., petroleum bitumen/coal tar pitch), oth ... | $16,861,548 | $12,268,269 | $5,603,883 | $7,386,644 | $7,700,317 | $9,321,746 | $9,924,565 |
| Total | $19,826,821 | $15,811,388 | $12,189,639 | $11,685,301 | $12,016,296 | $14,918,024 | $16,671,315 |
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