Obviously the EF-scale has changed things a bit as have construction/survey standards.... But there's actually pretty good evidence that the U.S. is seeing a gradual decrease in the number of high end tornado events as the climate has warmed.
Which makes sense, since the primary mechanism for higher end tornadoes is generally an airmass clash between cold/warm and humid/dry, and very broadly speaking our weaker cold airmasses today correlate to weaker lapse rates, and thus less potential forcing and energy for storms.
I think this one will work, at least till it ages out since it references today's runs.
https://polarwx.com/models/?model=gfs&base=record_500hght&background=plain_ocean&state=states_brown&country=countries_brown&proj=conus&archive=false&run=2026070712