More than 50 million new people have registered to vote in the past eight years, for a total of 200 million registered voters.
That means that 25% of the eligible voting public is a relatively new voter.
And it also means that more than 88% of the 227 million adult citizens are registered. If we take out the circa 5 million felons ineligible to vote, that raises the registration percentage to 90% of eligible adult citizens, surely a modern record for the United States.