Think you're getting some terms mixed up. The "national Helium Reserve" is a storage facility that is being drawn down because the us government doesn't think it's necessary anymore. When talking about a resource, helium reserves are how much there is available that can be produced at current prices. A resource is the total amount known about, even if it is too expensive to produce now. I didn't see your 100 year figure, but if it is the reserve, then when the price goes up, more will be added to the reserve.