Demand Modifiers for Clear-Cut Forest Hexes

What is the official method for determining the Climate demand modifier for settlements on land that (like much of medieval England or colonial America) was forest when it was settled, but where the forest has since been completely cut down and turned into farmland? Do you still use the Decidulous Forest modifiers, or does it become something else, such as Grasslands?

You still use the deciduous forest modifiers.