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| Commodity | 2005 | 2006 | 2007 |
| Roller chain of iron/steel | $9,782 | $18,483 | $48,224 |
| Articulated link chain other than roller chain, of iron/steel | $218,656 | $285,683 | $348,443 |
| Parts of articulated link chain of iron/steel | $93,740 | $104,324 | $113,674 |
| Skid chain of iron/steel | $8,569 | $46,011 | $8,778 |
| Stud-link chain of iron/steel | $31,090 | $25,993 | $38,144 |
| Welded link chain of iron/steel | $72,976 | $38 | $11,757 |
| Chain, of iron/steel, n.e.s. in 73.15 | $321,794 | $72,242 | $87,023 |
| Parts of chains (excl. articulated link chain), of iron/steel | $25,841 | $54,385 | $13,129 |
| Total | $782,448 | $607,159 | $669,172 |
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