Economies are divided according to 2010 GNI per capita, calculated using the World Bank Atlas method. Based on annual income, the four income groups are:

Low income, $1,005 or less
Lower middle income, $1,006 - $3,975
Upper middle income, $3,976 - $12,275
High income, $12,276 or more

Only one country in sub-Saharan Africa currently belongs to the high-income group, Equatorial Guinea.