I just found this story on the BBC:
Note: the map represents the results of the question "Are you personally affected by corruption in daily life?' - not the actual results of the survey.
What I find strange about the story is that I lived in and traveled through Europe for about 17 years and was never asked for a bribe or felt that others were being asked for them or giving them unbidden.
I'm trying to figure at what level this corruption took place, perhaps if you were looking for building permits or dispensations from safety regulations.
I do wonder why the difference between north and south is so high. I do remember many stories from travelers to the former Soviet Union of constantly being asked for bribes to get the simplest things done. I have no idea if anything has changed since then (ca 15 years ago).