Table 1.

Basic income classification based on the gross national income per capita (calculated using the World Bank Atlas method in US dollars)

Class	Number of countries	Total population
High-income countries	57 (31.8%)	1,238,673,312 (16.2%)
Upper-middle-income countries	48 (26.8%)	2,846,563,032 (37.2%)
Lower-middle-income countries	50 (27.9%)	2,984,937,312 (39.0%)
Low-income countries	24 (13.4%)	590,387,508 (7.7%)