Somalia is the most corrupt country in the world, followed closely by Afghanistan and Myanmar, according to researchers at the "global civil society organization" Transparency International.

The organization looks at issues such as how common bribery of public officials is, based on reports from multiple sources. It takes information from 13 different surveys of each nation and then develops rankings. By its measures, these are the most corrupt nations, in order:

1. Somalia.
2. Afghanistan.
3. Myanmar.
4 & 5. Sudan and Iraq (tie).
6. Chad.
7. Uzbekistan.
8, 9, 10, 11, 12 & 13. Turkmenistan, Iran, Haiti, Guinea, Equatorial Guinea and Burundi (tie).

The least corrupt nations, according to the group:

1. New Zealand.
2. Denmark
3 & 4. Singapore and Sweden (tie).
5. Switzerland
6 & 7. Finland and Netherlands.
8, 9 & 10. Australia, Canada and Iceland.

The United States ranked as the 19th "least corrupt" nation.

Transparency International has put together this video about its index: