Usage shows each player's share of his team's work (snaps, carries and targets) over the last three weeks, with the season figure beside it.
How it works
A share is the player's carries, targets or snaps out of his team's total. Recent weeks next to the season show who is gaining work: a back with 55% of the carries lately against 40% on the season is taking over the job.
NFL: from Sleeper's weekly stats. Air share is his share of the team's air yards (how far its passes traveled downfield, caught or not); red-zone looks are carries and targets inside the 20; targets per snap stands in for a target rate, since routes run aren't published for free.
College: from CollegeFootballData. Targets aren't published, so we count them from the play-by-play text. College snap counts aren't free either, so shares of touches stand in.
Keep in mind
Three weeks is a small window: a blowout or an injury mid-game can bend it. In college, a pass whose receiver can't be matched counts for the team only.
When it updates
Four times a day, around 5:30 and 11:30 AM and PM Eastern; during a week in progress, the games already played count.