Debt-to-GDP ratio for first world countries and average interest on that debt, using 10Y government bonds as a proxy.
The countries of Japan, United States, and Switzerland are highlighted in different colors. Japan and Switzerland are highlighted to show the outliers for highest debt and lowest bond yield, respectively. The United States is highlighted to be used as a benchmark. Debt-to-GDP data: https://tradingeconomics.com/country-list/government-debt-to-gdp