Seems to be a trend. Not sure if someone's already coined a term for it, but I've noticed that with each revision, each model of car tends to get a little bigger, a little roomier, etc. Over time they grow - after all, nobody wants to say that last year's model had more legroom and whatnot. Soon, there's no such thing as a small car in the lineup, and a new model is introduced at the bottom, repeating the process.