Time series for agricultural production statistics at sub-national level come with heterogeneous definitions for agric.production activities and with changing administrative units over time. Also, the availability of data is usually better for higher administrative levels (e.g. regions are better covered than districts). To generate consolidated time-series, it was necessary to define a harmonized classification for statistical units (WASU), which combines official admin units into comparable and time-invariant groups. Available information for all levels was fed into a consolidation process that ensured consistency across admin levels and accounted for obvious outliers(e.g.yields 10 times larger that in other years or comparable regions).

Crop production statistics at sub-national level are provided by national and international organisations at different levels of detail. The downloadable file is a combination of many sources with the aim to generate long time series for homogeneous crops. The crop classifications follow the WAGR nomenclature for crops provided by the same author. In general, the statistics were created as follows: 1. National Statistical Organisations, if not available then 2. FAO CountryStat, if not available then 3. FAO AgroMaps The National Statistical Organisations who provided agricultural production statistics were: Ghana: Ministry of Food and Agriculture (MOFA) Burkina Faso: STATISTIQUES AGRICOLES AU BURKINA FASO (AGRISTAT) Benin: Ministère de l’Agriculture de l’Elevage et de la Pêche (MAEP)