The series started in 1995 replacing the previous format of a single event final.
Also, this format means that the winner of each Grand Prix may not have been the rider who scores most GP points from each round.
The scoring system has been overhauled for the 2020 season which will see championship points scored based on the overall GP result of a rider rather than each individual heat of which those points will only decide the progress of a rider in a GP.
The same 15 riders form the basis of the Grand Prix line up throughout the course of the season, barring injuries.
The 15 permanent Grand Prix riders have been decided by various methods over the history of the series.