After the destruction of the old class structure, the Communist regime claimed that only two classes existed in the country, the workers and the working peasants. A somewhat different social composition of the population, however, has been given by the government's statistical yearbooks, based on the last official census, taken in 1960. Under the title "Social Composition of the Population," for instance, the 1965 statistical yearbook listed, in order, the following groups; workers, employees (civil servants), collective and private farmers (officially called villagers), collective and individual artisans, collective and private traders, free professions, clergymen, and unemployed and unknown (see table 4). In the 1967-70 period several of these groups disappeared. The individual farmers were all collectivized; the artisan collectives were converted to state industrial enterprises; the private traders, except the peasant open markets, were reduced to a minimum, and members of the clergy were sent to work either in industrial plants or agricultural collectives. The number of families almost doubled in the 1945-60 period. In the cities they grew from 48,800 to 95,500 and in the countryside, from 148,000 to 184,305. The greatest rate of increase, almost 8 percent, occurred during the 1950-55 period in the urban sector; this was attributed primarily to the creation of an industrial base. The expansion of the existing cities, especially the capital city of Tirana, caused by the establishment of a number of industrial projects, drew people from the rural regions into the urban centers. This new migration was reinforced by the relocation of entire families. In addition, new family units were formed by the younger migrants once they settled in the newly developing industrial centers. During the decade of the 1950s the trend was toward larger families. _Table 4. Social Composition of the Population of Albania_* _(according to the 1960 official census)_ Average Number of Number of number per Social Groups families persons Males Females family