Dakar is a major financial center, home to a dozen national and regional banks (including the BCEAO which manages the unified West African CFA currency), and to numerous international organizations, NGOs and international research centers. Dakar has a large Lebanese community (concentrated in the import-export sector) that dates to the 1920s, a community of Moroccan business people, as well as Mauritanian, Cape Verdean, and Guinean communities. The city is home to as many as 20,000 French expatriates. France still maintains an air force base at Yoff and the French fleet is serviced in Dakar's port.