GDP by Production approach, basic data – Total of economy

GDP - Production Methods, Final Expenditure, by Income - basic and detailed data - national level - GDP - seasonally adjusted data
Contact organisation

National Statistical Institute

Contact organisation unit

"Non-Financial National Accounts"

Contact name

Milen Kolev

Contact person function

Head of department

Contact mail address

2 P. Volov Str., Sofia 1038

Contact email address

[email protected]

Contact phone number

+359 2 9857 623

Contact fax number
Metadata update
Metadata last certified01 January 1970
Metadata last posted01 January 1970
Metadata last update01 October 2014
Statistical presentation
Data description

Seasonally adjusted data are data that are removed periodically recurring within a one period component of the time series - seasonal and calendar variations. Seasonally adjusted data show highlights the behavior of the studied fluctuations (changes in the direction of development and changes related to the business cycle).

Classification system

Classification of Economic Activities (CEA-2008, for international use NACE.BG-2008)

Sector coverage

Total of economy.

Statistical concepts and definitions

Fluctuations caused by abnormal levels of seasonal factors (e.g., extreme weather conditions or unusual circumstances) are visible in the seasonally adjusted data because they exceed or fall below the average seasonal values. Deviations of an occasional nature and unusual changes for which there is an economic explanation (e.g., effects of changes in economic policy, large procurement, natural disasters, etc.) are not eliminated in the season adjustment, i.e. they are part of the seasonally adjusted data.

Seasonal adjustment also includes the elimination of calendar effects, as far as they result from the difference in the number of weekdays and weekends, and can be quantified.

Seasonally adjusted data are data that are removed periodically repeated within period components of the series - seasonal and calendar variations. So seasonally adjusted data highlights the behavior of the studied variables (changes in the direction of development and changes related to the business cycle).

The seasonally adjusted lines contain random component (noise) having different levels in different series and the amount depends on the economic nature of the study, and applying the method of seasonal adjustment .

Seasonal adjustment of statistical indicators in the NIS is organized according to the "Guide of the European statistical system for seasonal adjustment". The procedure is performed using the software developed by Eurostat product Demeter, where by the algorithm TRAMO / SEATS.

The procedure for obtaining seasonally adjusted data includes correction of the series in terms of calendar effects and abnormal values. Calendar effects are expressed as :

  • differences in the number of working days in a given period;
  • effect of leap years ;
  • holidays with variable dates (Easter).

Adjustments for differences in the number of working days are made to obtain seasonally adjusted data, which are independent of the number and structure of days (number of Mondays, Tuesdays etc. / number of weekdays and weekends) in the quarter.

Abnormal values (outliers) are unusual changes in time series of a given indicator. Their manifestation can be in several ways, the most significant are the peak values (abnormal values of individual observations in the order), short-term changes (series of abnormal values to change the level of the indicator for a short period of time), changes in the level (a series of abnormal values ??with constant size and time- effect on the level of the indicator).

Statistical unit

Institutional unit under ESA2010 - enterprise, household, public institution.

Statistical population

economic territory of the country

Reference area


Time coverage

2000 - Third Quarter 2014* * Preliminary data

Base period


Unit of measure

Million BGN

Reference period


Institutional mandate
Legal acts and other agreements


Data sharing

Eurostat program to provide data on national accounts, the IMF, the UN.

Confidentiality - policy

· Law on Statistics;

· Regulation (EC) No 223/2009 on European statistics (recital 24 and Article 20(4)) of 11 March 2009 (OJ L 87, p. 164), stipulates the need to establish common principles and guidelines ensuring the confidentiality of data used for the production of European statistics and the access to those confidential data with du account for technical developments and the requirements of users in a democratic society.

Confidentiality - data treatment
Release policy
Release calendar

Statistical information is published 42-43 days after the relevant period and 70 days after the expiry of the relevant period.

Release calendar access

The calendar is available on the NSI website:

User access

Data is published on the NSI website, section Macroeconomic statistics - Gross Domestic Product in accordance with the Law on Statistics and the European Statistics Code of Practice respecting the professional independence and aimed at objectivity, transparency and equal treatment of all consumers.

Frequency of dissemination


Accessibility and clarity
News release

Press Release

On-line database

Data are available to all users of the NSI website under the heading Macroeconomic statistics - Gross Domestic Product - Quarterly seasonally adjusted data:

Micro-data access

Not applicable.

Documentation on methodology

Guide to the European Statistical System for seasonal adjustment, European System of Accounts (2010) (Eurostat).

Quality documentation
Quality management
Quality assurance

· European Statistics Code of Practice;

· Common framework for quality management in the National Statistical System.

Quality assessment

Questionnaire on the implementation of the principles of the European Statistics Code of Practice.

User needs
User satisfaction
Accuracy and reliability
Overall accuracy
Sampling error
Non-sampling error
Timeliness and punctuality

Quarterly rates:

  • Flash estimates of GDP - T +42-43 days after the reporting period
  • Current quarterly estimates of GDP - T +65 days after the reporting period
Coherence and comparability
Comparability - geographical
Comparability - over time
Coherence - cross domain

Additional information on other indicators in national accounts are available in other subject areas related to national accounts.

Coherence - internal
Cost and burden
Data revision
Data revision - policy

About the methods and revisions of seasonally adjusted data, seasonal adjustment of statistical indicators in the NIS is conducted in a harmonized European methodology described in the "Guide of the European statistical system for seasonal adjustment." The procedure is performed using the software developed by Eurostat product Demetra, whereby applied the algorithm TRAMO / SEATS.

Data revision - practice

Of seasonal adjustment are subjected data on GDP components in the manufacturing process and cost components for final use. Applies direct method of seasonal adjustment, in which the aggregates and their components undergo self - smoothing. As a result, there is a non - additivity of the seasonally adjusted data - the aggregates are not equal to the sum of their components. The parameters of the model for seasonal adjustment determined at the start of each calendar year / first quarter of the year / and in case of the used classification of economic activities. This targeted model is used to revise the seasonally adjusted values for the quarters within the dynamic lines.

Statistical processing
Source data

Information sources are not adjusted quarterly data for these indicators.

Frequency of data collection


Data collection

Quarterly data

Data validation
Data compilation

Apply seasonal adjustment of the data using software Demeter.

Metadata Structure Definition: ESMS_MSD+BNSI+2.0+SDMX.2.0.xml