You will be given a definition of a task first, then an example. Follow the example to solve a new instance of the task.
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.

Angola
Solution: 1975
Why? 1975 is the year of independence of Angola.

New input: China
Solution:
-1523