How to add lots of data to a list in a website

I have a website about some races.

I want to implement a page that has a list of the names and countries of the participants. Also when you click on the country, it will show all the participants from that country. However the number of the participants is very big to implement manually. How can I add all this data easy and fast?

Here is an example: http://ift.tt/2jZCi9j