Explanatory Notes on Main Statistical Indicators

Total population 　is based on the de facto definition of population, which counts all residents regardless of legal status or citizenship--except for refugees not permanently settled in the country of asylum, who are generally considered part of the population of their country of origin. The values shown are midyear estimates.

Age Dependency Ratio is the ratio of dependents--people younger than 15 or older than 64--to the working-age population--those ages 15-64. For example, 0.7 means there are 7 dependents for every 10 working-age people.

Crude Birth Rate is the number of live births occurring during the year, per 1,000 population estimated at midyear. Subtracting the crude death rate from the crude birth rate provides the rate of natural increase, which is equal to the population growth rate in the absence of migration.

Crude Death Rate is the number of deaths occurring during the year, per 1,000 population estimated at midyear. Subtracting the crude death rate from the crude birth rate provides the rate of natural increase, which is equal to the population growth rate in the absence of migration.

Total Fertility Rate is the number of children that would be born to a woman if she were to live to the end of her childbearing years and bear children in accordance with current age-specific fertility rates.

Adolescent Fertility Rate is the number of births per 1,000 women ages 15-19.

Contraceptive Prevalence Rate is the percentage of women who are practicing, or whose sexual partners are practicing, any form of contraception. It is usually measured for married women ages 15-49 only.

Maternal Mortality Ratio is the number of women who die during pregnancy and childbirth, per 100,000 live births. The data are estimated with a regression model using information on fertility, birth attendants, and HIV prevalence. Infant Mortality Rate　 is the number of infants dying before reaching one year of age, per 1000 live births in a given year.

Life Expectancy at Birth is the number of years a newborn infant would live if prevailing patterns of mortality at the time of its birth were to stay the same throughout its life.

Crude Marriage Rate 　is the number of marriages occurring in a population during a given period of time, usually a calendar year, i.e., the number of marriages occurring among the population of a given geographical area during a given year per 1000 mid-year total population of the given geographical area during the same year.

Crude Divorce Rate is the number of divorces occurring in a population during a given period of time, usually a calendar year, i.e., the number of divorces occurring among the population of a given geographical area during a given year per 1000 mid-year total population of the given geographical area during the same year.

Urban Population　 is the midyear population of areas defined as urban in each country and reported to the United Nations.