http://elections.gmu.edu/voter_turnout.htm
In 1968, the voting age non-eligible population was negligible, maybe 1% or so. By 1992 that had grown to over 5%. Most of the people are undocumented workers, but a number of them are felons, who in a dozen or so states are barred from voting for life (only four states allow felons in prison to vote, with a higher number for felons on probation or paroled).
In California, over 18% of voter age people are disenfranchised noncitizens. The number is over 10% in Arizona, Washington DC, Florida, Nevada, New Jersey, New York and Texas. Voting age noncitizens are 7.599% nationwide.
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