Best-selling sports cars ever

In February 2011, Mazda sold its 900,000th MX-5, confirming it as the best-selling two-seater of all time.
It also proved that sports cars are very far from being a dying breed - in fact they're enjoying unprecedented popularity.
But which are the best-selling sports cars of all time? We've bashed the keys on our calculator and come up with the 20 most popular sports cars of all time. And there are loads of surprises.
The first question to answer is: what exactly is a sports car? Tough one, that. There's no absolute definition.
It can't be just open-topped cars; it can't be just two-seaters; it can't be just fast cars.
What we can say is that it must have only two doors and be a standalone model, not an adaptation of an existing saloon.
So for example, the Ford Capri doesn't count. We're also only counting single generations, or single platforms.
Nissan's 'Z' series can lay claim to being the most successful sports car franchise of all time, with more than 1.6 million made from the 1969 240Z up to the current 370Z.
However, we're excluding the 1978-83 280ZX (440,059 sales) and 1983-89 300ZX Z31 (329,900 sales) because we think they're too soft to be counted as true 'sports cars'.