I had previously read the highest Neandertal DNA was in the Norse. That Neandertal were blond or red haired and contributed to the height.
I question that statement sir. I am reasonably sure that I have never seen a Neanderthal portrayed as a tall blue-eyed blond human. For starters the typical skull attributed to a Neanderthal looks nothing like the head of a Norseman. It would be statistically unlikely for the Neanderthal skull to evolve the shape to the newer version in a relatively short time.
Although maybe just as likely as Cho BiDung winning in 2020.
The percentage is probably higher than is (or perhaps can be) known, due to the small number of Neander-emains that have had DNA sequenced. Ya go to research with the DNA ya have. But the current average amount of Neandertal DNA that moderns carry is about the same as we get from 46 of our 64 6th-great-grandparents. That suggests that, due to the age of the N samples, a very large number of our ancestors were them, and Them is Us.
Whoops, sorry, 4th great-grands...