Not all North American polities participate in the NANP. Exceptions include Mexico, Greenland, Saint Pierre and Miquelon, the Central American countries and some Caribbean countries (Cuba, Haiti, the French Caribbean and the Dutch Caribbean, except for Sint Maarten, which uses the 721 area code). The only Spanish-speaking state in the system is the Dominican Republic. Mexican participation was planned, but implementation stopped after three area codes (706, 903 and 905) had been assigned, and Mexico opted for an international numbering format, using country code 52. The area codes in use were subsequently withdrawn in 1991. Area code 905, formerly used for Mexico City, was reassigned to a split of area code 416 in the Greater Toronto Area; area code 706, which had formerly served Mexico's Baja Peninsula, was reassigned to a portion of northern Georgia surrounding the Atlanta region, which retained 404; and area code 903, which served a small portion of northern Mexico, was reassigned to northeastern Texas when it split from area code 214.