Sources and Definitions for Country Facts and Figures

Capital, Language and Currency based on data from the United Nations Terminology Database.

Area refers to Total Surface Area. Data from UNSD Demographic Statistics 2008, United Nations Statistics Division.

Population, 2015, based on data from World Population Prospects: The 2015 Revision, United Nations, Department of Economic and Social Affairs, Population Division (2015).

Gross Domestic Product (Purchasing Power Parity). The sum value of all final goods and services produced in a country in a given year valued at prices prevailing in the United States of America.

GDP Per Capita (PPP), 2014, is Gross Domestic Product on a Purchasing Power Parity basis divided by the population. GDP Per Capita PPP based on data from the World Bank's World Development Indicators. Data are in current international dollars.

Human Development Index (HDI). A composite indicator that measures development and human progress based on health, education, and purchasing power. The higher the HDI rank, the higher a country's level of development. HDI Rank, 2014, based on data from the United Nations Development Programme's Human Development Report 2015.

Workers' Remittances (USD), 2014 estimates are the sum of workers' remittances, compensation of employees, and migrants' transfers. World Bank staff calculation based on data from IMF Balance of Payments Statistics database and data releases from central banks, national statistical agencies, and World Bank country desks.

Net Migration Rate, 2015-2020. The difference between the number of persons entering and leaving a country during the year per 1,000 persons. An excess of persons entering the country is referred to as net immigration (e.g., 3.56 migrants/1,000 population); an excess of persons leaving the country is referred to as net emigration (e.g., -9.26 migrants/1,000 population). Net Migration Rate based on data from the World Population Prospects: The 2015 Revision, United Nations, Department of Economic and Social Affairs, Population Division (2015).

Immigrants as a Percentage of the Population, 2015. Estimated number of immigrants divided by the total population, expressed as a percentage. The number of immigrants generally represents the number of persons born in a country other than that in which they live. Data from United Nations, Department of Economic and Social Affairs, Population Division (2015). Trends in International Migrant Stock: The 2015 Revision (United Nations database, POP/DB/MIG/Stock/Rev.2015).

Women as a Percentage of All Immigrants, 2015. The percentage of women migrants among all immigrants. Data from United Nations, Department of Economic and Social Affairs, Population Division (2015). Trends in International Migrant Stock: The 2015 Revision (United Nations database, POP/DB/MIG/Stock/Rev.2015).

Population under 15, 2015, refers to the percentage of persons below 15 years old with respect to the total population. Data from World Population Prospects: The 2015 Revision, United Nations, Department of Economic and Social Affairs, Population Division (2015).

Adult HIV Prevalence, 2014, refers to the percentage of adults aged 15 to 49 years old infected with the HIV virus. It is calculated by dividing the number of adults aged 15 to 49 years who have HIV in a given year by the population of adults of the same age group. Data from UNAIDS AIDSinfo database.