I know, although the US probably produces more from nuclear in absolute terms (or the US may well do so, I say without looking at the data).
And I am also aware that the Germans rely very heavily on coal.
12% is certainly a very notable proportion though, considering the technology is still very young.
In fact, Germany is in the process of phasing out nuclear entirely, it seems.
The main point was that there is a lot that can be done to expand wind and solar.