Setting the record straight

[leilanidude]

"Out of a total population of 600,000 in the islands and 155,000 registered voters, 140,000 votes were cast, the highest turnout ever in Hawaii. The vote showed approval rates of at least 93% by voters on all major islands (see adjacent figure for details). Of the approximately 140,000 votes cast, fewer than 8,000 rejected the Admission Act of 1959.
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600,000 total pop, how many under voting age? How many ineligible to vote? Sounds like a really high rate of voting and actual approval, in this case.