Idescat has modified the reference date of the Population Estimates and the Demographic Structure Indicators (structure by age, ageing, dependency and average age), replacing 31 December for 1 January. The aim of this change is to facilitate the comparability of data. Idescat already uses 1 January for the Population Register and Population Projections, and Eurostat also disseminates population figures and demographic indicators for all European countries referenced to 1 January of each year.
Idescat has adapted the entire series of Population Estimates and Demographic Structure Indicators from 1981 to the new 1 January reference date. This change of date has meant moving the entire series forward one year. So, for example, if until now the 2015 label corresponded to the population and demographic structure indicators as of 31 December 2015, with the change this population and these indicators will now be labelled as 2016.
The Population Estimates is a statistical operation performed every year, which provides a headcount of the population residing in Catalonia. They offer data of the residents in Catalonia, provinces, areas of the Territorial Plan, counties and Aran, and municipalities of 50,000 inhabitants or more, classified by sex and age. The results are consistent with the Population Census and demographic movement (births, deaths and migrations) The Population Estimates allow different demographic and socio-economic indicators to be calculated each year. The population estimates provide population figures for Catalonia that are comparable at international level. The population of Catalonia, on 1 January 2016 totalled 7.448.332 inhabitants, according to the Population estimates.
The Municipal Population Register is the administrative register in which the residents of a municipality are identified and represents proof of their residence. The municipalities are responsible for the management of the registers, and the INE is responsible for their coordination. Population figures from the revision of the Register on 1 January are declared official in each of the municipalities by the Government of Spain, by means of a Royal Decree. Idescat prepares a statistical analysis of the Municipal Population Register. The information is disseminated by place of residence of the population to municipal level, and is separated by sex, age, nationality and place of birth.