In contrast, import measures play only a minor role in relative terms. Support to biofuel use, mainly in the form of tax rebates or exemptions, are most widely spread across the countries covered by the database, but 23 of the 34 countries also apply biofuel mandates, requiring a minimum quantity or share of biofuels to be used in the transport fuel mix. Other forms of support, such as output-based payments or subsidies for the handling and storage of biofuels, play a comparatively smaller role across countries.