I think these numbers aren't comparable because they're normalized by employees, not employable population.

If you compare a traditional mom-stays-at-home family with a more typical German family they both might work 50-60 hours a week. The difference is that in the former case it's a male burning the midnight fuel in an office or working a side job and in the latter it's two parents working a 20-40 or 30-30 split or so.

So I think the difference would look much differently if you'd account for that fact.