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Table 10-1. (continued).

a 1989-1991 average of International Commodity prices (most recent available): These prices, derived from the Geary-Khamis equations for the agricultural sector, have been introduced to avoid the use of exchange rates. The "prices" are expressed in so-called "international dollars." This method assigns a single "price" to each commodity (e.g., 1 ton of wheat has the same price in whatever country it is produced). b Production figures are in metric tons for 1998. c Data not available.

Table 10-2. Total number of primary centers per world region and world value of agricultural production ascribed to primary centers of diversity (expressed as a fraction of total world value of the agricultural commodities)"_
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