(1922), Sundhausen (1974) and Uelleben (1994). Demographics Gotha has long been one of the largest towns in Thuringia. During the Middle Ages, it was a town of 5,000 to 6,000 inhabitants and its selection as a ducal residence brought another impetus during the 17th and 18th century, so that Gotha had already more than 10,000 inhabitants by 1800. The number rose to 15,000 around 1850, as industrialisation started and the city was connected to the railway. The population saw a steady growth to 23,000 in 1875, 35,000 in 1900, 46,000 in 1925 and 58,000 in 1950, when the peak was reached. Until 1990, the population was roughly constant at around 57,000. After German reunification in 1990, the city saw a significant decline in population, it shrank to 48,000 by 2000 and to 44,000 by 2012. Between 2013 and 2016, the population rose in each consecutive year. In 2016 it reached 45,640. The average decrease of population between 2009 and 2012 was -0.05% p.a, whereas the population in bordering rural regions is shrinking with accelerating tendency. Suburbanization played only a small role in Gotha. It occurred after reunification for a short time in the 1990s, but most of the suburban areas are situated within the administrative city borders. During the 1990s and the early 2000s, many inhabitants left Gotha to search for a better life in west Germany or other major east German cities like Jena or Erfurt. Since 2005, emigration is not a big issue anymore. Today, the birth deficit, caused by the high average age of the population, is becoming a bigger problem because immigration is not sufficient to compensate for it in recent years. Despite urban planning activities to tear down unused flats, vacancy was a problem with rates around 9% in 2011 but declined to 4% in 2017. A side effect of the high vacancy rate is Gotha's low rent level. The birth deficit was 175 in 2012, this is -3.9 per 1,000 inhabitants (Thuringian average: -4.5; national average: -2.4). The net migration rate was +6.2 per 1,000 inhabitants in 2012 (Thuringian average: -0.8; national average: +4.6). The most important regions of origin of Gotha migrants are bordering rural areas of Thuringia as well as foreign countries like Poland, Russia, Ukraine, Hungary, Serbia, Romania and Bulgaria. Like other eastern German cities, foreigners account for only a small share of Gotha's population: circa 2.5% are non-Germans by citizenship