• Data reference period
• Place of residence (NUTS - 2013)

• 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.
• 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.

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