https://3.bp.blogspot.com/-ad9rmXHhi2U/TaBxNpJvBtI/AAAAAAABI...
Over 4,000 recce balloons had entered their airspace up until the late 1970s and the Soviets compiled statistics that "on average 1.4 guided AAM's, 26 unguided rockets and 112 cannon rounds were used against each [destroyed] balloon"
https://en.wikipedia.org/wiki/Myasishchev_M-55
https://3.bp.blogspot.com/-ad9rmXHhi2U/TaBxNpJvBtI/AAAAAAABI...
Over 4,000 recce balloons had entered their airspace up until the late 1970s and the Soviets compiled statistics that "on average 1.4 guided AAM's, 26 unguided rockets and 112 cannon rounds were used against each [destroyed] balloon"