text: -15.4 -14.1 -6.2 -9.9 -9.7 -4.7 -5.2 -10.3 Source: ECJ .. secreturiat eE:timates based on data in Interna­ t ion all -.:Cnanc i al Statistics, vol. XXXV 1 No .11 (November 1982). re£ for 19L2-are -prei ·irn-inary estimates based on less than 10 months • data. ~/ In US dollar terms. 4. The changes in Africa's trade are presented in table VI.A.1. 110 E/ECA/C!-1. 9/5 The volune of Africa's exports has been falling continuously, and in 1982 it was about 31 per cent !ewer than at the end of the 1970s. 5. I~ 1982 the value of Africa's imports (i~ US dollar terms) fell considerably, for the second time sb1ce 1~61; the first was a drop of 1.9 per cent in 1967 because of the Irab-Israeli war. 6. The foreign trade (exports plus imports) of Africa's three major oil exporters (Algeria, the Libyan Arab Jamahiriya and Nigeria) accounted for about 54.4 per cent of developing Africa's total trade in 1981. This share compares with 57 per cent in 1980, and a further contraction is expected in 1982. Despite this set-back the foreign trade of these three countries deserves special attention: data appear in table VI.A.2. Table VI.A.2 Merchandise trade of Africa's major oil exporters ~/ (Percentage change over preceding year) 1980 1981 1982 Value b/ Exports 48.1 -25.2 -22.9 Imports 55.2 20.3 -19.8 Volume Exports ·-13.2 -31.7 -14.8 Imports 28.8 30.3 Unit value £/ Exports 70.6 9.5 -9.5 Imports 20.5 -7.7 Terms of trade 41.6 18.7 Purchasing power of exports 23.0 -18.9 Source: As for table VI.A.l. ~/ Algeria, the Libyan Arab Jar.1altiriya and Nigeria. ~/ In US dollar terms. 7. The value and volume of exports in 1982 were about 14.5 and 49.4 per cent lower respectively tl1an at the enG. of the 1970s. 
analysis: The text primarily discusses the trade performance of Africa in 1982, focusing on the decline in exports and imports, and the impact of the foreign trade of major oil exporters. The data provided is related to the value and volume of exports and imports, as well as the terms of trade and purchasing power of exports. This suggests that the text is more concerned with economic aspects rather than other areas such as health, education, or culture.