Use the reference link to get to a PDF file that captures a large and complex graphic produced by Transparency International for Bloomberg BusinessWeek. It's all very cats-and-dogs in presentation style, so I summarize here.
Factoid: Wonder why Greece has financial problems? Well, the average bribes paid per household in 2009 amounted to $1700, beating fairly corrupt Russia by a grand ($776) and backward Afghanistan by far more ($160).
Comparing countries by percentage of households that said they paid a bribe in last 12 months:
Per my Core-Gap map: best seem furthest from Gap, middling are those on Seam, worst are deep inside Gap.