What percentage of bombs that were dropped in WWII duds? And how did the participants of WWII diffuse these dud bombs?

There are many stories about modern bomb diffusal (with robots and such), but how did governments back in the 1940s diffuse unexploded bombs? I am assuming that there are many duds considering the amount of bombs dropped in the Battle of Britain and during the bombing campaigns by the allies against both Germany and Japan.

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