By the way, very briefly, I looked it up while you asked. The U.S. does not publish the number for lithium. It's withheld for confidentially reasons, but it's very small.
For the threshold, the way I would think of it is we have a lot of well-established tools that we've used in other industries about industry concentration, diversification and measuring the share of the top three and the top five suppliers. We have a lot of different ways to think of criticality in this sector, especially as we look to a rapidly growing sector. You can't look at a resource today and say, “Well, it's not material”, because frankly, every resource that we have is going to have to expand tremendously over the next 10 to 20 years.
We need to apply a bit more imagination to visualize what this world is going to look like. We can't just look at 2022 and prejudge too much the importance of these assets for the future.