What determines if a country should be included in the “Export Earnings: Fuel” category in the Direction of Trade Statistics (DOTS) and the International Financial Statistics (IFS) datasets,
The “Export Earnings: Fuel” category (formerly named Oil Exporting Countries) includes countries that have mineral fuels, lubricants, and related materials (specifically SITC Code 3) comprising over 50 percent of their exports.
Other related information:
The DOTS dataset can be found here.
The IFS dataset can be found here.