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Your numbers are wrong and most likely you're counting *all* categories of nuclear waste, including stuff like gloves or clothes used for nuclear medicine which are required by law to be treated as "nuclear waste".
I don't know about Germany but in the UK there was just 2150 m3 high-level nuclear waste from all 60-years long nuclear program (!).
Just for comparison, a coal plant produces ~2000 m3 of slightly radioactive ash in a day (!) or so.