Who's in the 30% housing club

How much of your monthly take-home salary do you spend on rent or mortgage payments? One school of thought suggests that, ideally, residents should be spending no more than 30% on these costs. So where are the cities where this is actually realistic? 

UK 30% club
30% club world

Brought to you by Compare the Market, the mortgage insurance experts.

The population figures were taken from the most recent census estimates for each country from http://www.citypopulation.de.

sources and methodology