Many observers believe that Sonangol was already acting as a sovereign wealth fund by investing its profits in many areas outside of the oil industry -- including buying up key stakes in Portugal's biggest bank by assets, Millennium BCP.

CNN: Oil-rich Angola bids to secure future with $5bn wealth fund

This year's BCP report shows that loss of IT, telecommunications and people are likely to have the most significant impact on business in the current environment.

CNN: Be a better boss with the Institute