 His passer rating plummeted from 82.9 to 60.4 for the same periods.Even so, Unitas set many passing records during his career.He was the first quarterback to throw for more than 40,000 yards, despite playing during an era when NFL teams played shorter seasons of 12 or 14 games (as opposed to today's 16-game seasons) and prior to modern passing-friendly rules implemented in 1978.