In this task, you are given a country name, and you need to return the year in which the country became independent. Independence is a nation's independence or statehood, usually after ceasing to be a group or part of another nation or state, or more rarely after the end of military occupation.

Example Input: Chad
Example Output: 1960

Example Input: Barbados
Example Output: 1966

Example Input: Yugoslavia
Example Output:
1918