There’s nothing wrong with debt per se – in fact, some of the world’s biggest economic powers have a lot of it. Yet there’s a fine line between a healthy and an unhealthy amount. In 2010, the World Bank published a study which revealed that a 77% debt-to-GDP ratio was the tipping point, and that countries which stayed above this threshold for long periods saw significant slowdowns in economic growth. Using the most recent data from the International Monetary Fund (IMF)’s World Economic Outlook (October 2019), here are the most in-debt nations on the planet as we enter 2020. (We haven't included countries with economies smaller than $10 billion (£7.6bn) GDP.)