Sub-Saharan Africa has been strongly affected by the global recession, despite initial optimism that the global financial system would have few spillover effects on the continent. The International Monetary Fund (IMF) estimated in 2009 that average economic growth in Africa would slow to 1%, from an annual average of over 6% to 1% over the previous five years, before rebounding to 4% in 2010. As a region, Africa is not thought to have undergone a recession in 2009.