german 88 artillery misses

[Cap'n Crunch]

Milch differed radically from Hitler in his proposals for combating the
troublesome British bombing attacks by night. Hitler still believed in a strong
defence by flak and searchlights. The state secretary, although a former artillery
officer himself, was not enamoured of anti-aircraft artillery: he once calculated
that besides the huge and costly ground organization it had taken on average
2,313 rounds of heavy flak and 4,258 rounds of light flak to bring down each
aircraft they had claimed up to the end of November 1940

From The Rise and Fall of the Luftwaffe, the biography of Milch. You can grab a free copy here, plenty of good stuff.

http://www.fpp.co.uk/books/Milch/

He wasn't a big fan of flak or impressed with its results to cost ratio. Too much manpower and resources wasted, and they never at any time reduced enemy effectiveness below 90% efficiency in hitting their targets.