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Well, it's based on "expert assessments", whoever those are.
Sounds totally reliable then. I wouldn't take this stuff for granted at all. Everything I know about these countries is telling me the opposite. Everywhere you go, you will find endless scandals, but the scale of gravity varies enormously from place to place.
Should I regard your expertise on the matter as superior to theirs? 
Rather, you should disregard metrics based on "perception" as being as reliable as reading tea leaves. Go find some data instead.
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