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“Corruption Perceptions Index, which ranks 180 countries and territories by their perceived levels of public sector corruption according to experts and businesspeople, uses a scale of 0 to 100, where 0 is highly corrupt and 100 is very clean.” - Transparency International
Meanwhile, New Zealand is the least corrupt country according to the 2017 index. The country scored 89/100. This shows that no country is 100% clean. Thus, there will always be fight against corruption.