**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

**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:

_{}

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:

_{}

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.