Every year Transparency International - the global coalition against corruption publishes Corruption Perception Index in countries around the world. Denmark and New Zealand top again with "very clean" scores over 90/100. The main reason of countries' success is strong inland corruption control.
Let's remind some basic facts about the index:
Source: Corruption Perceptions Index
Scores - ranges between 10 "Very Clean" to 0 "Highly Corrupt"
Governance and Corruption in Developing CountriesUniversity of Paris-1
It is interesting that there is no relationship between actual level of corruption in the country and how people assess government's actions in the fight against corruption. In such a "clean" from corruption countries like Finland, Norway, Switzerland or Canada over 50% of respondents assess government's actions in the fight against corruption as ineffective. Similarly people estimate their governments in much more corrupted countries like Russia, China and Brazil. One conclusion that probably could be done out of this comparison is that government's activity doesn't have much influence on the "perceived" level of corruption in countries...