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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Roller chain of iron/steel | $172,957,623 | $198,758,804 | $251,195,884 | $330,298,482 | $267,661,504 | $388,843,097 | $531,941,570 |
| Articulated link chain other than roller chain, of iron/steel | $19,000,632 | $22,485,717 | $28,315,218 | $32,003,816 | $7,592,687 | $15,328,175 | $25,186,941 |
| Parts of articulated link chain of iron/steel | $8,514,317 | $11,001,055 | $15,722,369 | $20,013,046 | $9,866,971 | $16,273,298 | $34,542,605 |
| Skid chain of iron/steel | $33,159,593 | $41,013,113 | $34,185,097 | $34,817,828 | $40,107,537 | $55,243,905 | $81,716,022 |
| Stud-link chain of iron/steel | $4,703,311 | $7,183,759 | $15,690,912 | $220,202,969 | $200,942,483 | $200,702,523 | $223,506,957 |
| Welded link chain of iron/steel | $217,670,591 | $281,248,861 | $334,072,767 | $258,221,803 | $169,507,418 | $213,695,315 | $318,788,604 |
| Chain, of iron/steel, n.e.s. in 73.15 | $49,600,186 | $62,615,613 | $82,078,145 | $95,713,378 | $92,534,536 | $108,943,951 | $135,229,218 |
| Parts of chains (excl. articulated link chain), of iron/steel | $16,986,156 | $19,657,387 | $18,741,710 | $22,916,214 | $12,534,920 | $15,948,178 | $15,313,893 |
| Total | $522,592,409 | $643,964,309 | $780,002,102 | $1,014,187,536 | $800,748,056 | $1,014,978,442 | $1,366,225,810 |
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