Because of the dearth of domestic resources in relation to the needs for economic development and consumption, foreign trade has consistently shown a negative balance. A marked improvement in this respect has taken place since 1955, even though the absolute deficit has been growing with the rising trade volume. In the 1960s exports covered 60 percent or more of imports, compared with 47 percent in the 1956-60 period and 31 percent in the preceding eleven post-World War II years. This improvement in the trade balance has been achieved through a consistent policy of diversifying domestic production with a view to import substitution, developing all possible resources for the production of exportable goods, improving product quality, and severely restricting domestic consumption. The annual trade deficit in 1967 and 1968 was about 200 million leks. The volume of trade has been rising quite steadily from 140 million leks in 1950 to 950 million leks in 1968. During this period imports increased from 110 million to 580 million leks, and exports rose from 30 million to 370 million leks. The Fourth Five-Year Plan calls for an increase of 31 percent in total trade over the volume of the preceding five years, including an increase of 36 percent in exports and 28 percent in imports. These figures imply a planned average annual trade volume in the 1966-70 period of 885 million leks, of which 355 million leks were exports and 530 million leks imports. Although the rate of trade expansion during 1966-68 exceeded the target, the export-import ratio was not as favorable as that called for by the plan. The directional pattern of the country's foreign trade has conformed to the general observation that trade follows aid. The assumption by Communist China in 1961 of the major aid donor position previously held by the Soviet Union had an immediate and pronounced impact on the direction of trade. In 1960 Communist China accounted for only 7 percent of the total trade volume, as against 54 percent for the Soviet Union. By 1962 trade with Communist China had grown to 51 percent of a somewhat smaller total volume, whereas trade with the Soviets had ceased altogether by 1963. In 1964 Communist China's share of the trade was equal to that of the Soviet Union in 1960, and the actual volume represented by that share was 23 percent larger. During the 1962-68 period trade with Communist China amounted to about half the total trade volume, but the share of Communist China declined below that level toward the end of this period. This decline was the result of a successful effort by the leadership to expand the country's trade with both Communist Eastern Europe and the non-Communist West.