Accounting for 14 per cent of world trade (Table I), the importance of the United States as a market for exports and a source of imports for selected Commonwealth countries is shown in Tables XVIII and XIX. The growing proportions of exports from Nigeria and Trinidad and Tobago shipped to the United States are attributable to higher volumes and prices of petroleum, while the lower share of Indian imports derived from that source, comparing 1972 and 1973 with 1969 and 1970, is due to a drop-off in food aid shipments.