Definition: Average (or mid-year or mean) population

Category: Demography

The average population during a calendar year is generally calculated as the arithmetic mean of the population on 1 January of two consecutive years (it is also referred to as the mean population). However, some countries calculate it differently, using the population based on registers or estimating it on a date close to 1 July (mid-year population).
Eurostat, "Demographic statistics: Definitions and methods of collection in 31 European countries (2003 Edition)", Luxembourg, 2003