Wonder how indebted your country really is? The debt-to-GDP ratio compares a nation's external debt to its total output for a year and is a handy way to judge the overall state of a country's economy and ability to pay its dues. 

A ratio of over 100% means a country isn't producing enough to cover what it owes, while a rising ratio can signal that a recession is on its way and a consistently high ratio is usually accompanied by poor economic growth. 

With this in mind, read on to discover the debt-to-GDP ratios of 24 of the world's largest economies, from the lowest to the highest.

All dollar values in US dollars.