That is very low. In Munich most people are in the 30-50%. I was in the 17%, but that's just because most of my rent is paid out by the company I work for. Otherwise it would be around 30%.
Where I live in the US I'm at 30% post-tax. I could probably get this down to about 20%, but I'd be adding on an hour or more of commute each way, and I'm in a pretty desirable part of the city.
