Chinese people in Japan include any people self-identifying as ethnic Chinese or people possessing Chinese citizenship living in Japan. People aged 22 or older cannot possess dual-citizenship in Japan, so Chinese possessing Japanese citizenship typically no longer possess Chinese citizenship. The term "Chinese people" typically refers to the Han Chinese, the main ethnic group living in China (PRC) (including Hong Kong and Macau SARs), Taiwan (ROC) and Singapore. Officially, China (PRC) is home to 55 additional ethnic minorities, including people such as Tibetans, though these people might not self-identify as Chinese. Han Chinese people have had a long history in Japan as a minority. Most Chinese people, or descendants of Chinese immigrants, who are living in Japan reside in major cities such as Osaka, Yokohama, and Tokyo, although there are increasingly also significant populations in other areas as government immigration policies increasingly attract workers to 'training programs', universities seek increasing numbers of international students and Chinese people see business opportunities. Japan's first recognised Chinatown was in Nagasaki, developing in the 1680s when economic prerogatives meant that the shogunate needed to restrict and control trade to a greater extent than previously. Before this, there had been a large number of Chinese communities in the west of the country, made up of pirates, merchants, and people who fitted into both categories. In the 19th century, the well-known Chinatowns of Yokohama and Kobe developed, and they are still thriving today, although the majority of Chinese people in Japan live outside Chinatowns in the regular community. The communities are served by Chinese schools that teach the Chinese language. The Chinese community has undergone a dramatic change since the PRC allowed more freedom of movement of its citizens, but citizens of Taiwan (ROC), Singapore and Hong Kong nationality are not counted in these figures.