Well yeah, the demand and population are there, but I was thinking (stereotypically) that Germany was some industrial giant, and thus it must be up there (top 3, maybe) in production. Don't get me wrong, 4th is still damn good.
Well, UK is a look at how far they've dropped. They used to have numerous car manufacturers, and now they've either been split apart, bought up, or are barely hanging in there.
BTW, does Bentley and Rolls Royce still considered British or is it now labeled as German? Because the chart on Wikipedia included GM of Belgium under Germany.