**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 3l^{st} of December, not
including residents in

**Urban
Population and Rural Population Urban** population refers to all people residing in cities and towns, while
rural population refers to population other than urban population.

**Birth
Rate (or Crude Birth Rate) refers** to the ratio of the number of births to the average population (or
mid-period population) during a certain period of time (usually a year),
expressed in ‰. Birth rate in the chapter refers to annual birth rate. The
following formula is used:

_{}×1000‰

Number of births in the formula refers to
live births, i.e. when a baby has breathed or showed any vital phenomena
regardless of the length of pregnancy.

Annual average 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 by 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-period population)
during a certain period of time (usually a year), expressed in ‰. Death rate in
the chapter refers to annual death rate. The following formula is used:

_{}

**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-period population) of the same period, expressed in
‰. The following formula is applied:

_{}

×1000‰

Natural Growth Rate of Population = Birth
Rate-Death Rate

**Gross
Dependency Ratio** also called gross dependency
coefficient, refers to the ratio of non-working-age population to the
working-age population, express in %. Describing in general the number of
non-working-age population that every 100 people at working ages will take care
of, this indicator reflects the basic relation between population and economic
development from the demographic perspective. The gross dependency ratio is
calculated with the following formula:

Where: GDR is the gross dependency ratio,

P_{0-14 is} the population of children aged 0-14,

P_{65+ is} the elderly population aged 65 and over, and

P_{15-64} is the working-age population aged 15-64.

**Old
Dependency Ratio also** called old dependency coefficient, refers to the ratio of the
elderly population to the working-age population, express in %. It describes
the number of the elderly population that every 100 people at working ages will
take care of. Old dependency ratio is one of the indicators reflecting the
social implication of population aging from the economic perspective. The old
dependency ratio is calculated with the following formula:

Where: ODR is the old dependency ratio,

P_{65+ is} the elderly population aged 65 and over, and

P_{15-64} is the working-age population aged 15-64.

**Children
Dependency Ratio** also called children dependency
coefficient, refers to the ratio of the children population to the working-age
population, express in %. It describes the number of children population that
every 100 people at working ages will take care of. The children dependency
ratio is calculated with the following formula:

Where: CDR is the children dependency ratio,

P_{0-14 is} the children population aged 0-14, and

P_{15-64} is the working-age population aged 15-64.