Ma Nowemapa 9, ua hoʻolaha ka American Iron and Steel Association i Kepakemapa 2021, ua hōʻea ka nui o nā ukana kila o ʻAmelika Hui Pū ʻIa i 8.085 miliona tons, he piʻi makahiki-ma-makahiki o 21.3% a he emi mahina-ma-mahina o 3.8%.
Mai Ianuali a Kepakemapa, ʻo ka nui o nā ukana kila o ʻAmelika Hui Pū ʻIa he 70.739 miliona tons, he piʻi makahiki-ma-ka-makahiki o 17.0%.
Eia kekahi, mai Ianuali a Kepakemapa, ua piʻi ka hoʻouna ʻana o nā ʻāpana pale corrosion o ʻAmelika Hui Pū ʻIa ma 19% i kēlā me kēia makahiki, ua piʻi ka hoʻouna ʻana o nā ʻāpana ʻōwili anu ma 17% i kēlā me kēia makahiki, a ua piʻi ka hoʻouna ʻana o nā ʻāpana ʻōwili wela ma 12% i kēlā me kēia makahiki.