Roma people have been in Germany since the Middle Ages. They were persecuted by the Nazis, and thousands of Roma living in Germany were killed by the Nazi regime. Nowadays, they are spread all over Germany, mostly living in major cities. It is difficult to estimate their exact number, as the German government counts them as "persons without migrant background" in their statistics. There are also many assimilated Sinti and Roma. A vague figure given by the German Department of the Interior is about 70,000. In contrast to the old-established Roma population, the majority of them do not have German citizenship, they are classified as immigrants or refugees. After World War II, 14 million ethnic Germans were expelled from the eastern territories of Germany and homelands outside the former German Empire. The accommodation and integration of these "Heimatvertriebene" in the remaining part of Germany, in which many cities and millions of apartments had been destroyed, was a major effort in the post-war occupation zones and later states of Germany. Since the 1960s, ethnic Germans from the People's Republic of Poland and Soviet Union (especially from Kazakhstan, Russia, and Ukraine), have come to Germany. During the time of Perestroika, and after the dissolution of the Soviet Union, the number of immigrants increased heavily. Some of these immigrants are of mixed ancestry. During the 10-year period between 1987 and 2001, a total of 1,981,732 ethnic Germans from the FSU immigrated to Germany, along with more than a million of their non-German relatives. After 1997, however ethnic Slavs or those belonging to Slavic-Germanic mixed origins outnumbered these with only Germanic descent amongst the immigrants. The total number of people currently living in Germany having FSU connection is around 4 to 4.5 million (Including Germans, Slavs, Jews and those of mixed origins), out of that more than 50% is of German descent. Germany now has Europe's third-largest Jewish population. In 2004, twice as many Jews from former Soviet republics settled in Germany as in Israel, bringing the total inflow to more than 100,000 since 1991. Jews have a voice in German public life through the Central Council of Jews in Germany (Zentralrat der Juden in Deutschland). Some Jews from the former Soviet Union are of mixed heritage. In 2000 there were also around 300,000–500,000 Afro-Germans (those who have German citizenship) and 150,000+ African nationals.