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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 ... | $22,174,500 | $19,148,400 | $20,459,400 | $19,304,400 | $13,712,900 | $9,676,900 | $2,835,800 |
| Articles of asphalt/sim. mat. (e.g., petroleum bitumen/coal tar pitch), oth ... | $2,181,900 | $4,951,600 | $11,118,400 | $14,216,200 | $9,530,800 | $11,561,800 | $5,556,200 |
| Total | $24,356,400 | $24,100,000 | $31,577,800 | $33,520,600 | $23,243,700 | $21,238,700 | $8,392,000 |
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