| Date | Study | StudyURL | Source | Website | Population | PopulationDensity | CountryId |
|---|---|---|---|---|---|---|---|
| 12/31/2015 | Population and Demographic Processes | http://www.nsi.bg/en/node/13035 | National Statistical Institute Bulgaria | http://www.nsi.bg/otrasalen.php?otr=53&a1=1583&a2=1584&a3=1586 | 7153000 | Bulgaria |