Argentina
Cabo Verde
Costa Rica
BBC Mundo report (updated to June 29, 2015), Spain heads the list with 14 defaults, followed by Venezuela and Ecuador with 11 each; Brazil in third with 10; Argentina, El Salvador and Germany in fifth with 8 each; Colombia, Uruguay and Portugal with 8 each; the United States, Bolivia, Turkey, Russia, Greece and the Austrian-Hungarian empire with 6 each; and lastly Nigeria with 5.
In contrast, there are very few countries that have never defaulted (paid their debts or restructured). These include Switzerland, Belgium, Norway, Finland, South Korea, Singapore and New Zealand.