It has been a gradual change, however it is definitely there. Our cars have gotten bigger. Hondas, Porche, even Minis going to Maxi-Minis, and Fords, SUVs.
The infographic is focused on telling one story about the growing size of cars, and the design style is superb. By using images and outlines of the actual cars, it tells the story much better than a bar chart would have