Based on this it doesn’t seem bad hail storms are getting worse or more frequent. Appears there were fewer in the last decade than previous decades.
en.m.wikipedia.org
I don't think cost/damage is the proper way to track hail activity.
Or really any other weather event. There is frequent criticism of the Enhanced Fujita Scale ratings of tornadoes because it is based on damage indicators. But some of the most powerful tornadoes haven't hit shit as far as structures go and were much stronger than the rating. See the 2013 El Reno tornado, wind speeds measured by Doppler on Wheels at 295 mph, but "only" rated EF-3.
The largest hailstone recorded was 8" diameter, 18" circumference ,and weighing TWO POUNDS...after considerable melting before being recorded And that's just the largest recorded in that storm, many were recorded at 6". Vivian SD, July 2010, population 95. So in monetary damages, nothing much and not on that list. Had that storm happened over a large city it would have been catastrophic.
The fact is, the worst supercell events are often over sparsely populated areas, because that's just how the Plains is.
If I am bored tonight I will research deeper for occurrences of large hail per year. But I'm going to the casino, so no promises. But even this method will have biases, as there are far more spotters and chasers today to actually see and record these events, and Dual Pol Doppler radar has also been a game-changer verses the past. 75 bBZ? We know the hail is destructive sized, even if no one is there.