This seems kind of a "Lies, damned lies, and statistics" thing to measure. It makes large centralized conflicts (one war between two states where ten million people die) seem a lot less severe in comparison to decentralized conflicts (ten wars between twenty local groups where one million people die in total).

That's the result of spending trillions in war every year, if you prepare for war that's what you get.

That's not what the top graph seems to indicate (the 80s)

If my neighbor keeps waking me up at 5:30am there's gonna be another one. /s of course