The 2007 Transparency International Corruption Perceptions Index
According to the annual survey by the Berlin-based organization Transparency International, Finland, Denmark, and New Zealand are perceived to be the world's least corrupt countries, and Somalia and Myanmar are perceived to be the most corrupt. The index defines corruption as the abuse of public office for private gain and measures the degree to which corruption is perceived to exist among a country's public officials and politicians. It is a composite index, drawing on 14 polls and surveys from 12 independent institutions, which gathered the opinions of businesspeople and country analysts. Only 180 of the world's 193 countries are included in the survey, due to an absence of reliable data from the remaining countries. The scores range from ten (squeaky clean) to zero (highly corrupt). A score of 5.0 is the number Transparency International considers the borderline figure distinguishing countries that do and do not have a serious corruption problem.
Countries that have significantly improved their rating since the 2006 index were Costa Rica, Croatia, Cuba, Czech Republic, Dominica, Italy, Macedonia, Namibia, Romania, Seychelles, South Africa, Suriname, and Swaziland. Some of the countries that have a significantly worse rating since 2006 include Austria, Bahrain, Belize, Bhutan, Jordan, Laos, Macao, Malta, Mauritius, Oman, Papua New Guinea, and Thailand.
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