in the case where the majority of the basic data are available and reliable and the adjustments are based on sound judgement the estimate of the food available for human consumption is likely to be reliable burkina faso is known to be a major producer of sorghum millet and maize and a net importer of rice the differences in maize and sorghum not consumed according to insd amount to and tonnes respectively or of total production these quantities have probably been exported in which case they should be found entering a neighbouring country hence errors in food energy supply estimates of one country can have repercussions on the estimates of other countries in the region