Because the game is different. I am not certain how you are but in todays games, you have way more snaps on Offense then you ever did, even when Emmitt played. The Defenses today are really not built to stop the run. They are built to defend the pass. The Defenses that Emmitt played against when he was coming up were just different. Was a much more physical game in those days. You could target the football with your helmet, you could target the head, you could actually target the center and play him heads up on the snap. You could gang tackle. You could actually finish off ball carriers. So many things are different now in how the game is actually played, that effect the stats.