| Number | Concept | Description |
|---|---|---|
| 1 | Data description | Births and deths are registered at the moment of occurrence and and the number is calculated as of 31.12 of the reference year. |
| 2 | Classification used | Unified Classification of Administrative-Territorial and Territorial Units (UCATTU) |
| 3 | Coverage | The number of live births includes all children born alive in the reference year with an usual residence (present address) within the observed cities, their Larger Urban Zones and in the contry. The number of deaths includes all dead persons with usual residence (present address) within the observed cities, their Larger Urban Zones and the contry. |
| 4 | Unit of measure | Number |
| 5 | Reference period | 31 December of the reference year |
| 6 | Time coverage | 2010-2016 |
| 7 | Release policy | Information is published annually according to the Release Calendar presenting the results of the statistical surveys carried out by the National Statistical Institute. |
| 8 | Dissemination format | • www.nsi.bg |
| 9 | Methodological documents | • Methodology for studying of births and deths; • Compilation of variable definitions - Eurostat |
| 10 | Source data | Information System "Demography" Information on demographic events (births, deaths) is received from the National Civil Registration System. |
| 11 | Frequency of data collection | Monthly |
| 12 | Data collection method | Exhaustively for all registered demographic events during the year. Computer files are received from the National Civil Registration System (administrative source). |
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