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: Trinidad and Tobago
Example Output: 1962

Example Input: Kazakstan
Example Output: 1991

Example Input: Mongolia
Example Output:
1921