Country sample
| Albaniad | Costa Ricac | Indiaa,d | Nicaraguaa,c | Uruguaya,c |
| Algeriab | Côte d'Ivoirea,b | Indonesiaa,d | Nigera,b | Vietnama,d |
| Argentinac | Democratic Republic of the Congoa, b | Jamaicac | Nigeriaa, b | |
| Armeniaa, d | Dominican Republicc | Jordana,b | Pakistana,d | |
| Azerbaijand | Ecuadorc | Kenyaa,b | Panamac | |
| Bangladesha,d | Egypta,b | Madagascara,b | Paraguayc | |
| Benina,b | El Salvadorc | Malawia,b | Peruc | |
| Boliviaa,c | Gabonb | Malaysiad | Philippinesa,d | |
| Botswanab | Georgiaa,d | Malia,b | Senegala,b | |
| Brazilc | Ghanaa,b | Mauritiusb | Sierra Leonea,b | |
| Burundia,b | Guatemalac | Mexicoc | Sri Lankad | |
| Cameroona,b | Guinea-Bissaua,b | Moroccoa,b | Thailandd | |
| China (People’s Republic of)d | Guyanac | Mozambiquea,b | Tunisiaa,b | |
| Colombiac | Haitia,c | Namibiab | Turkeyd | |
| Congoa,b | Hondurasa,c | Nepala,d | Ugandaa,b |
| Albaniad | Costa Ricac | Indiaa,d | Nicaraguaa,c | Uruguaya,c |
| Algeriab | Côte d'Ivoirea,b | Indonesiaa,d | Nigera,b | Vietnama,d |
| Argentinac | Democratic Republic of the Congoa, b | Jamaicac | Nigeriaa, b | |
| Armeniaa, d | Dominican Republicc | Jordana,b | Pakistana,d | |
| Azerbaijand | Ecuadorc | Kenyaa,b | Panamac | |
| Bangladesha,d | Egypta,b | Madagascara,b | Paraguayc | |
| Benina,b | El Salvadorc | Malawia,b | Peruc | |
| Boliviaa,c | Gabonb | Malaysiad | Philippinesa,d | |
| Botswanab | Georgiaa,d | Malia,b | Senegala,b | |
| Brazilc | Ghanaa,b | Mauritiusb | Sierra Leonea,b | |
| Burundia,b | Guatemalac | Mexicoc | Sri Lankad | |
| Cameroona,b | Guinea-Bissaua,b | Moroccoa,b | Thailandd | |
| China (People’s Republic of)d | Guyanac | Mozambiquea,b | Tunisiaa,b | |
| Colombiac | Haitia,c | Namibiab | Turkeyd | |
| Congoa,b | Hondurasa,c | Nepala,d | Ugandaa,b |
Notes:
aLow and lower-middle income countries; bAfrican countries; cAmerican countries; dAsian countries
The classification is made in accordance with the World Bank. Countries are grouped into low, lower-middle, upper-middle and high income. Income is measured using gross national income per capita.
For instance, Albania has one superscript of 4, meaning it has been classified as Asian country but not low and low-middle-income country; Egypt has two superscripts of 1 and 2, meaning it has been classified as low and lower-middle-income country and African country
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