• Data reference period
• Geographic localization (Portugal)

• GROSS DOMESTIC PRODUCT:  Final result of the production activity of resident producer units and it can be defined in three ways: production approach, expenditure approach and income approach.
• 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).
• AVERAGE POPULATION:  The average population during a calendar year, generally calculated as the arithmetic mean of the population on two consecutive years.
• CHAIN-LINKED VOLUME SERIES:  Series of values, usually quarterly or annual ones, which fix a certain year as reference and whose values reflect the real changes rates between any two times / periods of the concerned series.
• ANNUAL CHANGE RATE:  Change rate that displays the variation between two annual values (year t and year t-1) of a certain variable.
• ECONOMIC TERRITORY:  Territory that consists on: (a) the geographic territory administered by a government within which persons, goods, services and capital move freely; (b) any free zones, including bonded warehouses and factories under customs control; (c) the national air-space, territorial waters and the continental shelf lying in international waters, over which the country enjoys exclusive rights; (d) territorial enclaves (i.e. geographic territories situated in the rest of the world and used, under international treaties or agreements between States, by general government agencies of the country (embassies, consulates, military bases, scientific bases, etc.); (e) deposits of oil, natural gas, etc., in international waters outside the continental shelf of the country, worked by units resident in the territory as defined in the preceding subparagraphs.

GDP/ Average population

Quotient of the value of the last year, by the value of the previous year.