For that indicator, FAO provides data for Sierra Leone from 1961 to 2017. The average value for Sierra Leone during that period was 1340 kg per hectar with a minumum of 941 kg per hectar in 1961 and a maximum of 1956 kg per hectar in 2017.
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Definition: Cereal yield, measured as kilograms per hectare of harvested land, includes wheat, rice, maize, barley, oats, rye, millet, sorghum, buckwheat, and mixed grains. Production data on cereals relate to crops harvested for dry grain only. Cereal crops harvested for hay or harvested green for food, feed, or silage and those used for grazing are excluded. The FAO allocates production data to the calendar year in which the bulk of the harvest took place. Most of a crop harvested near the end of a year will be used in the following year.