Na Nọvemba 9, American Iron and Steel Association kwupụtara na na Septemba 2021, mbupu ígwè US ruru nde tọn 8.085, mmụba afọ n'afọ nke 21.3% yana mbelata kwa ọnwa kwa ọnwa nke 3.8%.
Site na Jenụwarị ruo Septemba, mbupu ígwè US bụ nde tọn 70.739, mmụba kwa afọ nke 17.0%.
Na mgbakwunye, site na Jenụwarị ruo Septemba, ụgbọ mmiri US na-ebufe warara na-eguzogide corrosion mụbara site na 19% kwa afọ, mbupu mmiri oyi na-ebufe na-abawanye site na 17% kwa afọ, na mbupu mpempe akwụkwọ na-ekpo ọkụ mụbara site na 12%. afọ na-afọ