text: The average price of oil rose in 1981, but in 1982 fell back to around its 1980 1 eve!. Hydrocarbon exports accounted for 96.2 and 94.8 per cent of the three countries' total exports in 1980 and 1981. 8. While the Libyan Arab Jamahiriya and Nigeria export mainly crude oil, Algeria has divers if iec1 its hydrocarbon trade. Its combined exports of refined products, condensates, liquid petroleum gas and natural gas now earn substantially more than exports of crude oil, which has continued to dec! ined in sig- 111 E/ECA/CM.9/5 nificance. Algeria, indeed, produced less crude oil than Egypt in the first half of 1982. At the same time the prospects of its gas exports (e.g. through the trans-Mediterranean pipeline to Italy) are. good. 9. The value of exports from non-oil-exporting developing. Africa in 1S82 was only slightly higher than at the end of the 1970s. Imports grew considerably in 1980-1981, provoking a trade deficit of almost $ 18 bill ion in 1981. The terms of trade and the purchasing power of exports evolved unfavourably in 1980- '1981. Preliminary estimates for 1982 suggest contir.ued dif­ ficulties. Table VI.A.3 illustrates the trade problems of 47 countries in developing Africa in the early 1980s. Table VI .A. 3 Kerchandise trade of non-oil-exporting developing Africa (Percentage change over preceding year) 1980 1981 1982 Value a/ Exports 18.6 -11.1 -3.4 Imports 24 .a. 11.8 -8.8 Volume Exports 11.9 -1.8 4.5 Imports -0.3 13.8 Unit value E_/ Exports 6.0 -9.5 -7 .• 6 Imports 25.2 -1.7 Terms of trade -15.3 -7.9 Purchasing power of exports -5.2 -9.5 Source: As for table VI.A.l. ~/ In US dollar terms. 10. Host of non-oil-exporting developing Africa is south of the Sahara. The sub-Saharan group's performance has been much weaker than that of the non-oil-producing group as a whole.· Exports 
analysis: The text primarily discusses the economic performance of non-oil-exporting developing countries in Africa, specifically their trade balance, terms of trade, and purchasing power of exports. The text also touches on the importance of hydrocarbon exports for some countries and the decline of crude oil exports. This suggests that the category should be related to economic development and international trade.