|
| Commodity | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Roller chain of iron/steel | $61,873 | $319 | $83 | | $4,000 | |
| Articulated link chain other than roller chain, of iron/steel | $227 | | | | | |
| Skid chain of iron/steel | | | | | | $805 |
| Chain, of iron/steel, n.e.s. in 73.15 | | $1,184 | $19,316 | $111 | $145,028 | $30 |
| Total | $62,100 | $1,503 | $19,399 | $111 | $149,028 | $835 |
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