Rodolfo, it's a pleasure to talk to you. Thank you for sending your question. I'd like to begin my answer. And by the way, Japur, feel free to add anything you want to comment on.
As for scrap shortage in the U.S., it's not related to prime scrap with a reduction of automotive production. This brings a shortage of scrap in the U.S. market, but also lesser scrap that we use, particularly in our long steel, we have an adequate purchase volume and volatility over the last months, in our point of view, it will continue to be like this.
However, the outlook for metal spread over 2022 is quite positive. We understand that with this metal spread at historic high levels and the evolution over the last 4 years, considering also our performance in North America, we have conditions to support the results that we achieved in the first quarter. So they continue over 2022. And moving forward, if we consider demand, I made a point and remind you that we continue to have a very, very strong backlog. This backlog has not been reduced. Quite the opposite, this April it increased a little. So we still don't see any demand effect coming from the infrastructure package. It is possible to be more visible by year-end demand-wise.
So wherever we look in our U.S. operations, we are very confident that the result level will be sustainable. The greatest challenge ahead right now in North America has to do with manpower, labor. Recently, we checked the data that was disclosed of unemployment in the U.S. The number is going up, opportunities of 10 million to 11.5 million job opportunities, which is very significant. Almost 4.5 U.S. citizens changed jobs for the last month.
So that's a challenge for us. But despite the challenge, this is the best time of our history in terms of industrial and operational performance with a historic level of delivery this May. And we currently, we reached levels of production [indiscernible] mills over 400,000 tonnes, rarely did we see that in the past. And considering this despite the lower number of mills that we have since the divestments, we've been managing to have a performance in the growth level that has been unprecedented in the U.S. market. With regards to the cost, the pressure goes on, volatility also goes on. Although for the greatest challenge ahead are costs related to metallurgical, they have an impact on plant, but costs related to our scrap mills and bioproducer, I would say they are relatively under control as we speak.
This inflation rate, to some extent, was already included in the cost that we had in the first quarter. And the challenge is to keep on managing the supply chain in general. Any possible disruption, particularly in logistics that may happen in the coming months, so they don't have an impact on our production capacity, particularly in North America.