New York City:

Mass transit in New York City, most of which runs 24 hours a day, accounts for one in every three users of mass transit in the United States, and two-thirds of the nation's rail riders live in the New York City Metropolitan Area.

Please answer a question about this article. If the question is unanswerable, say "unanswerable". What fraction of United States rail riders call the New York City Metropolitan Area home?
two-thirds