• Data reference period
• Place of residence (NUTS - 2002)

• RESIDENT POPULATION:  The persons who regardless of the fact that at the moment of observation ' 0:00 a.m. of the reference day ' are present or absent in a given housing unit, this unit being where they live during most of the year with their family, or where they have all or most of their belongings.
• REFERENCE PERIOD:  Period to which the information refers and which may be a specific day or a time interval (month, fiscal year, calendar year, among others).
• FOREIGN POPULATION HAVING REQUESTED RESIDENT STATUS:  Foreign citizens who, in a given year, have requested for a resident permit under current legislation on regulation of entry, stay, departure and expulsion of foreigners in national territory.

(Foreign population who have applied for resident status/ Resident population)*100