Agriculture is the traditional mainstay of the Cambodian economy. Agriculture accounted for 90 percent of GDP in 1985 and employed approximately 80 percent of the workforce. Rice is the principal product. Agricultural history Rice production, a vital economic indicator in Cambodia's agrarian society, frequently fell far short of targets, causing severe food shortages in 1979, 1981, 1984, and 1987. The plan's 1987 target for the total area to be devoted to rice cultivation was 1.77 million hectares, but the actual area under cultivation in 1987 amounted to only 1.15 million hectares. After 1979 and through the late 1980s, the agricultural sector performed poorly. Adverse weather conditions, insufficient numbers of farm implements and of draft animals, inexperienced and incompetent personnel, security problems, and government collectivization policies all contributed to low productivity. Collectivization and solidarity groups Collectivization of the agricultural sector under the Heng Samrin regime included the formation of solidarity groups. As small aggregates of people living in the same locality, known to one another, and able to a certain extent to profit collectively from their work, they were an improvement over the dehumanized, forced-labor camps and communal life of the Pol Pot era. The organization of individuals and families into solidarity groups also made sense in the environment of resource-poor, post-war Cambodia. People working together in this way were able to offset somewhat the shortages of manpower, draft animals, and farm implements. In 1986, more than 97 percent of the rural population belonged to the country's more than 100,000 solidarity groups. Unlike the large communes of the Khmer Rouge, the solidarity groups were relatively small. They consisted initially of between twenty and fifty families and were later reduced to between seven and fifteen families. The groups were a form of "peasants' labor association," the members of which continued to be owners of the land and of the fruits of their labor. According to a Soviet analyst, the solidarity groups "organically united" three forms of property—the land, which remained state property; the collectively owned farm implements and the harvest; and the individual peasant's holding, each the private property of a peasant families. In theory, each solidarity group received between ten and fifteen hectares of common land, depending upon the region and land availability. This land had to be cultivated collectively, and the harvest had to be divided among member families according to the amount of work each family had contributed as