The amount of a crop that a farmer can harvest per acre is referred to as crop yield. Farmers have been able to increase their crop yield by adopting the use of genetically modified (GM) crops. What's the general trend shown in the graph?

Crop yield is the measurement often used for a cereal, grain or legume and is normally measured in metric tons per hectare (or kilograms per hectare). Crop yield can also refer to the actual seed generation from the plant. For example, a grain of wheat yielding three new grains of wheat would have a crop yield of 1:3. And you left out the graph