The National Assembly is a unicameral legislature of South Korea. The latest legislative elections were held on 11 April 2012. Single-member constituencies comprise 246 of the assembly's seats, while the remaining 54 are allocated by proportional representation.[2] Members serve four-year terms. The unicameral assembly consists of at least 200 members according to the Constitution. In 1990 the assembly had 299 seats, 224 of which were directly elected from single-member districts in the general elections of April 1988. Under applicable laws, the remaining seventy-five representatives were appointed by the political parties in accordance with a proportional formula based on the number of seats won in the election. By law, candidates for election to the assembly must be at least thirty years of age. As part of a political compromise in 1987, an earlier requirement that candidates have at least five years' continuous residency in the country was dropped to allow Kim Dae-jung, who had spent several years in exile in Japan and the United States during the 1980s, to return to political life. The National Assembly's term is four years. In a change from the more authoritarian Fourth Republic and Fifth Republic (1972–80 and 1980–87, respectively), under the Sixth Republic, the assembly cannot be dissolved by the president.