The best description of the graph is that "the percentage of of acres that is dedicated to genetically engineered crops grew from 1996 to 2005" The y-axis of the graph has the percentage of acres dedicated to genetically modified crops, while the x-axis has the years. The four lines show the four types of crops that are grown. All of the lines are observed to have a direct correlation between the values of y and x, so the percentage of acres dedicated is increasing with time.
