Please do....I'd bet the percentage is less than 5%.
Richard Dent went in 8th round Deacon Jones went in the equivalent of the end of the 6th round, Bart Starr went at the equivalent of the 6th (more rounds less players) Shannon Sharp went round 7, Cortland FInnegan went in the 7th, Jamal Anderson was a 7th round pick, Harold Carmichael went int he equivalent of the 6th round, Bo Jackson went in the 7th, Seth Joyner went in the8th Marques Colston went in the7th, Stevie Johnson went in the 7th, Richard Dent in the equivalent of the 6th, Ken Houston equivalent of 7th, Chris Hanburgh I believe the equivalent of undrafted maybe end of 7th, same with Raymond Berry and John Madden.
And ignoring the more studly players with reps, Al Morris, Byron Maxwell, Jason Kelce, Greg Hardy, Antonio Brown, and Kyle Williams all went in recent 6th round.
Sure there's a good chance the guy you take that late amounts to nothing, but there is the potential to do some damage with those picks.