Data are mid-year estimates. Since 2010 balance of population is based on the results of the Population and Housing Census 2011. For years 1999 (as of December, 31) to 2009 balance of population is based on the results of the National Population Census 2002. For years 1989 to 1999 (as of June, 30) data based on estimates method. Prior to 1989, adjustments in the population series associated with census years (1988, 1978 and 1970), result in statistical discrepancies in the sum of components of change in population