Between 1929 and 1939, with the rise of Nazism in Germany, a new wave of 250,000 immigrants arrived; the majority of these, 174,000, arrived between 1933 and 1936, after which increasing restrictions on immigration by the British made immigration clandestine and illegal, called "Aliyah Bet". The Fifth Aliyah was again driven almost entirely from Europe, mostly from Central Europe (particularly from Poland, Germany, Austria, and Czechoslovakia), but also from Greece. Some Jewish immigrants also came from other countries such as Turkey, Iran, and Yemen. The Fifth Aliyah contained large numbers of professionals, doctors, lawyers, and professors, from Germany. Refugee architects and musicians introduced the Bauhaus style (the White City of Tel Aviv has the highest concentration of International Style architecture in the world with a strong element of Bauhaus) and founded the Palestine Philharmonic Orchestra. With the completion of the port at Haifa and its oil refineries, significant industry was added to the predominantly agricultural economy. The Jewish population reached 450,000 by 1940.