Get-damage-caused
From FreeSpace Wiki
Get damage caused (Status operator) Returns the amount of damage one or more ships have done to a ship. Takes 2 or more arguments... 1: Ship that has been damaged. 2: Name of ships that may have damaged it.
Notes
This returns the amount of damage (in percentage) done relative to the ship's default hitpoints. A ship with 1000 default hitpoints will return 10 if 100 points of damage were applied. If you raise the ship's hitpoints to 2000 in FRED (Ship Editor --> Special Hitpoints), then 100 points of damage will return 10 again, though the actual damage is 5%.