Furthermore Chartered Investment Germany (CIG) is a German subsidiary of the Japanese securities trading bank PWM Japan Securities. As of 1985 over 90% of ethnic Japanese households in West Germany had an affluent corporate executive as the head of the household. This executive often stays in Germany for three to five years. As of 1985 company employees arriving in Germany often move into residences formerly occupied by those returning to Japan. As of 2005 the Japanese population was about one third of that of London. As of the 2010s 6,500 Japanese resided in the city. Eric Zielke, a professor at University of Düsseldorf, stated around 1985 that Japanese often only interact with Germans when doing and being involved with business. He concluded that "the Japanese have no particular interest in becoming integrated into German society" because many are in Germany for only a three to five-year period, and that "The Japanese form a colony, remaining unobtrusive and keeping to themselves." The Japanische Internationale Schule in Düsseldorf, a Japanese international school, is in Düsseldorf. It opened in 1971 and gained a permanent building in 1973. In 1985 the school had 880 students. The Japanische Ergänzungsschule in Düsseldorf (デュッセルドルフ日本語補習校 "Dyuserudorufu Nihongo Hoshūkō"), a Japanese weekend school, is a part of the institution. In the spring of 1985, Japan Airlines started a flight from Tokyo to Düsseldorf on a twice weekly basis. In 2014 All Nippon Airways established a flight from Tokyo to Düsseldorf. Previously ANA had a dedicated shuttle bus from Düsseldorf to Frankfurt Airport so passengers may board ANA flights at the airport, but the bus service was discontinued after ANA began its Düsseldorf flights. The bus stopped at the Radisson Blu Scandinavia Hotel. The (在デュッセルドルフ日本国総領事館; Japanisches Generalkonsulat Düsseldorf) is located in the city. The Japan Day in Düsseldorf is held annually.