Approximately 40,000 British civilians had been killed, another 46,000 injured, and more than a million houses damaged during the Blitz. The German air fleets lost 600 German aircraft on night operations. The Coventry raid, which for a short time caused a decline of 20 percent of aircraft output, recovered. The effect on general industrial production was not significant. In five months of bombing docks and ports in 1941, only some 70,000 tons of food stocks were destroyed, and only one half a percent of oil stocks. Damage to communications was quickly repaired. Everywhere except in the aircraft industry the loss was too small a fraction of total output to matter seriously.