Explanatory Notes on Main Statistical Indicators

Total Population refers to the total number of people alive at a certain point of time within a given area．

The annual statistics on total population is taken at midnight，the 3lst of December，not including residents in Taiwan province， Chinese compatriots in Hong Kong and Macao and overseas Chinese．

Urban Population and Rural Population are classified， in general， with the permanent population．

Urban Population refers to the population living in areas under the jurisdiction of cities or towns．

Rural Population refers to the population of counties excluding those living in towns．

City refers to cities established with the approval of the central government．

Town refers to towns established with the approval of the governments of province， autonomous region， or municipality directly under the central government． Prior to 1963， a town was defined as an area with more than 2000 permanent residents， of which 50% or more were non-agricultural population. A revision of the definition was made in 1964. By the new definition, a town was an area with more than 3000 permanent residents, of which 70% or more were nonagricultural population or an area with more than 2500, but lower than 3000 permanent residents, of which 85% or more were nonagricultural population. Further adjustment was made in 1984： a town is defined as: (1) an area being the location of countylevel government agency， or (2) a township with a total population less than 20000, where the nonagricultural population of the location of a township government exceeds 2000; or (3) a township with a total population more than 20000, where the proportion of the nonagricultural population to the total population of the location of a township government is greater than 10%; or (4) a remote area, mountainous area， small-sized mining area， small harbor， tourism area， or border area with nonagricultural population less than 2000．

Birth Rate or (Crude Birth Rate) refers to the ratio of the number of births to the average population during a certain period of time（usually a year）， which is often expressed in ． The following formula is used：

Birth Rate＝Number of Births / Average Number of Population1000

Number of births refers to live births，i.e. the births when babies had showed any vital phenomena regardless of the length of pregnancy．

Annual Average Number of Population is the average of the number of population at the beginning of the year and that at the end of the year. Sometimes it is substituted for with the midyear population．

Death Rate（or Crude Death Rate） refers to the ratio of the number of deaths to the average population（or midyear population）during a certain period of time（usually a year）， which is often expressed in ． The following formula is used：

Death Rate＝Number of Deaths / Annual Average Number of Population1000

Natural Growth Rate of Population refers to the ratio of natural increase in population（number of births minus number of deaths）in a certain period of time（usually a year）to the average population（or midyear population）of the same period， which is often expressed in ． The following formulas are applied：

Natural Growth of Population＝(Number of Births－Number of Deaths) / Average Number of Population1000

Natural Growth Rate of Population＝Birth Rate－Death Rate

Employed Population refers to population aged 15 or over engaging in social labour which generates income．

Unemployed Population refers to population aged 15 or over not engaging in any social labour which generates income， including students enrolled in schools， house wives， students waiting for entering schools with higher level， urban job seekers， retirees， job quitters， disabled， etc．

Total Dependency Ratio refers to the ratio of number of dependents to the total population aged 15-64，the number of dependents being population aged 0-14 and population aged 65 and over. The total dependency ratio is calculated as follows：

Total Dependency Ratio＝Number of dependents/Population aged 15-64100％

The Aged Dependency Ratio refers to the ratio of the number of the aged population to the total population aged 15-64，the aged being population aged 65 and over. The aged dependency ratio is calculated as follows：

The Aged Dependency Ratio＝Number of the aged population/ Population aged 15-64*100％

The Juvenile and Children Dependency Ratio refers to the ratio of the number of the juvenile and children to the total population aged 15-64，the juvenile and children being population aged 0-14. The juvenile and children dependency ratio is calculated as follows：

The Juvenile and Children Dependency Ratio＝Number of juvenile and children/ Population aged 15-64 *100%