5. Democratic Republic of Congo
8. Central African Republic
Here's the fancy map. Click a country to see how they rank.
Personally, I think Zimbabwe is worse than Somalia. Peter Leeson suggests Somalia isn't (or at least wasn't) as bad as people say. Ben Powell has a paper with Ryan Ford and Alex Nowrasteh titled “Somalia After State Collapse: Chaos or Improvement?” forthcoming in the Journal of Economic Behavior & Organization.
HT: Astrid Arca