The title and thesis of the infographic are, to me, clear: that the number of annual automotive traffic deaths exceeds the largest amount of deaths of ever from a single disaster event in each category.

Though perhaps, now that the issue is raised, it would be more poignant to take something like the worst year of the deaths for each category, instead of the worst single event; the only one of the list I'd expect to get markedly worse from this amendment would be flooding, but it would pre-empt this possible objection. You could, if you like, denote the difference between the worst single event and other events that year with a slightly different color shade in the same box area.