Who uses what number and why?

In Formula 1, all drivers use a fixed race number. The championship introduced this concept in 2014 to increase the recognition of the drivers on the track for the fans. In previous years, the starting numbers were handed out based on the final ranking in the previous world championship standings.

Now only the world champion for the new season can choose to change his number: he gets the offer to replace the permanent number with the #1. All other drivers must…