Fusion Power on the way - at last ?

Out of curiousity, how did they calculate that?Is that the total number of deaths ever caused divided by the total number of TW/h that has ever produced?Or are the deaths divided by some kind of average production rate of energy, or something?I wonder how the fact that so much coal has been used throughout history and that nuclear is a relative newcomer to the party effects the disparity in those levels if you calculate it over all the energy that has ever been produced rather than some kind of rate of production, or whatever.

That just makes it a difference between what has been the safest and what can be the safest.Regardless, I still think nuclear has been and can be the safest of them all.I was just curious if the disparity would change much.