Well according to this we are! More than anyone else. https://pbs.twimg.com/media/C6wMf2mXUAA61AW.jpg:large
It doesn't define what they mean by team - is it the starting XI, the 18 in the match-day squad, players who play in the matches (Chelsea is the only club to use all 3 subs in every league game). That simple piece of information would give this some more context.
I'd imagine it refers to the 25-man squads - to produce such a graph with any other parameters would be a tad onerous.