Ah, the battle for the Christmas number one slot. Before reality TV existed, it used to be fun. Now, it feels increasingly like the joy has been taken out of it all a little.

Still, not always. And this new infographic breaks down plenty of nuggets of information about festive chart toppers – from the most successful ever, to bits of trivia that might just win you a pub quiz.

Here, then, is an analysis of the Christmas number one. And you can read even more here.