Having occupied the territory, Turks left in wholesale numbers when they lost control of it. More of them departed during the Balkan wars. Large groups emigrated in the 1920s and 1930s, and more were forced to leave after World War II. Estimates as to the numbers involved in each move vary widely; the two largest after 1880 were those in the 1920s and after World War II, and the total in all emigrations of Turks probably equals or exceeds the 700,000 that remain in the country. Natural population increases have been such that, over the long term, the actual number of Turks in the country has changed relatively little. There have been smaller population exchanges with each of the other neighbors. In the mid-1920s about 250,000 Bulgarians moved from Greek Thrace into Bulgaria, and about 40,000 Greeks left Bulgaria for Greece. After 1940, when southern Dobrudzha was annexed from Romania, some 110,000 Romanians were exchanged for about 62,000 Bulgarians. Macedonians, also in considerable numbers, have chosen between Bulgaria and Yugoslavia, requiring many of them to move. The Jewish people, faring much better in Bulgaria during World War II than they did in Adolph Hitler's Germany or in most of the countries overrun by the Germans, have nonetheless emigrated to Israel in large numbers. Before that war there were about 50,000 of them in the country, but 90 percent or more of them emigrated during the early postwar years. All of the major emigrations were completed before 1960. There appear to be no reasons why others of similar proportions should occur in the foreseeable future. Working Force In mid-1972 there were 5.8 million people in the working-age group (fifteen to sixty-four years), although the legal retirement age in most employment situations is sixty or sixty-five for males and five years younger for females. About 4.4 million--just over one-half of the total population and three-quarters of those of working age--constituted the labor force. Population projections indicate that in the ten-year period after 1972 the working-age group will increase by 0.3 million, but a large percentage of the increase will be in the segment of the group aged fifty to sixty-four. About 95 percent of the males between twenty-five and sixty-four years of age are economically active. The percentage of economically active females is lower, but they have constituted over 40 percent of the labor force. About 36.5 percent of the economically active are employed in agricultural fields; of the remaining 63.5 percent, about one-half are employed in industry. The others are in various service, administrative, or other miscellaneous activities.