Which country will default next?

Blackrock - leader in ETFs - released a new sovereign risk index score that ranks 44 countries on potential default risk. At the bottom: Greece, Portugal, Venezuela, Egypt, Italy, Hungary...Spain (Vishawanathan Anand's favorite) @no.36. US @no.15. China@14. India@32. No.1 is Norway. Wondering why China is closer to US in default - the former's savings are the latter's debt. Scientific - not standard and poor.