Mimi, I'll try to explain. Rankings go in 52 weeks circle, the race starts at the beginning of the year. However, at the end of the year, both rankings and the race are equal because points from the rankings keep dropping as the season moves on, but you keep gaining points in the race.
so whatever you 'earned' in rankings last year (talking about points), you are losing this year, but you gain points in the race based on your results this year.
so race = rankings at the end of the year.