1990 POPULATION CENSUS Detailed data based on a 2 per cent representative sample (1992)

V. EXPLANATION OF CONCEPTS

The explanations of the concepts used are as follows: POPULATION With regard to the 1870-1960 period, the population data refer to the present population and, with regard to the 1970-1990 period, to the permanent and resident population, respectively.The data with regard to the period between 1870 and 1890 cover only the size of the civil population, and between 1900 and 1990 that of the totál population. The population data of the 1990 population census are lower than the estimations with regard to the size of the population from various sources, so the size of the population is by 193 000 (by 1.8 per cent) lower than 10 568 000 according to current population estimates. The difference can be attributed to several factors: - after the 1990 population census — contrary to the practice followed till 1980 — corrections eliminating the lack of surveys were not effectuated. The growths in the population size resulting from the earlier procedures appear in the present data as a factor increasing the difference compared to the results of 1980; - the population estimates could not take into account the extent of the decrease in the population size in consequence of international migration; - compared to the population census carried out ten years earlier several persons were omitted from the enumeration due to the social tensions and the refusals resulting from them, respectively; - because of the deficiencies of the registration system, the persons registered both permanently and temporarily, were not always surveyed according to the instructions and, conseguently, such persons could have been omitted from the survey both in the place of their permanent and temporary residences; - the reliability of the lists of addresses and names taken from the data base of the State Population Registration Office which substituted the directories of the enumeration districts of the earlier population censuses, is not sufficient. In the international practice — taking into considération the respective UN recommendations —, various countries, in their data publications based on the results of the population census, use the size of the population enumerated and consider as acceptable alsó undercounts of 2-3 per cent. In the present publication — in conformity with the international practice —, the size of the resident population enumerated is indicated. Present population is the population in the place of the enumeration at the census moment. The permanent population contains the data of persons having a registered permanent dwelling in the given area, independently whether they do or do not have registered temporary dwelling elsewhere. To this group belong those persons too, who were abroad for somé reason (employment, learning, fulfilment of a diplomatic, commercial, scientific mission) at the census moment but had a permanent registered dwelling in the given area. The resident population consists of two groups: - the population having a registered permanent dwelling in the respective area and having no temporary registered dwelling elsewhere, - persons having a registered temporary dwelling in the respective area, regardless to whether they were or not present at the census moment. 250