destruction rate; destruction ratio
Technical term used in engineering, disaster analysis, or military contexts to express the proportion of something destroyed.
The destruction rate of buildings due to the earthquake varies greatly by region.
In this simulation, we assumed a missile destruction ratio of 80%.
損傷率 means 'damage rate' and is broader, covering any damage, not necessarily complete destruction.
Compound of 破壊 (destruction) and 率 (rate, ratio).