The demographics of Ukraine relate to population growth, population density, ethnicity, education-level, health, economic status, religious affiliations, and other aspects of the population of Ukraine. The data in this article are based on the 2001 Ukrainian census (the most recent census), the CIA World Factbook, and State Statistics Committee of Ukraine figures. The next census, originally scheduled to take place in 2020, was re-scheduled in 2020 to take place in 2023. The State Statistics Service of Ukraine estimated the total population of the country (excluding Crimea) on 1 January 2022 at around 41 million. During the War in Donbas, the Ukrainian government lost control of portions of the Donbas region. Additionally, due to the Russian invasion in 2022, more than 8million Ukrainians fled the country in a refugee crisis. History There were roughly four million Ukrainians at the end of the 17th century. The majority of the historical information is sourced from Demoscope.ru. The territory of modern Ukraine at the times listed above varied greatly. The western regions of Ukraine, west of Zbruch river, until 1939 for most of the time were part of the Kingdom of Galicia and later the Polish Republic. The detailed information for those territories is missing, for more information see Demographics of Poland. The Crimean peninsula changed hands as well, in 1897 it was a part of the Taurida Governorate, but after the October Revolution became part of the Russian SFSR, and in 1954 was turned under the administration of the Ukrainian SSR. The territory of Budjak (southern Bessarabia) became a part of the Ukrainian SSR in June 1940. The censuses of 1926 through 1989 were taken in the Ukrainian SSR. The census of 1897 is taken with the correspondence to nine gubernias that included in the territory of today's Ukraine. The statistics of 1906 records are taken from www.statoids.com which provides a broad degree of historical explanation on the situation in the Imperial Russia. The census statistics of 1931 was estimated by Ukrainian professor Zenon Kuzela (1882–1952) from Berlin. His calculations are as of 1 January 1931. This ethnographer is mentioned in the encyclopedia of Ukraine as one of the sources only available due to lack of the official census. The 2001 census was the first (and so far only) official census of independent Ukraine. Its data is given as on 1 January. The 2003–2009 stats were taken from the official website of Ukrstat