The metric is the number of deaths attributed to dependence on computers compared to the (presumed) number of deaths that could have happened in "safety-critical software controlling health equipment, aircraft, weapons systems and industrial processes, including nuclear power stations", that is, software where it was presumed that formal proofs were essential for correct operations.
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[ 2.8 ms ] story [ 15.8 ms ] threadhttps://en.wikipedia.org/wiki/Sturgeon%27s_law - 90% of everything is crap.