The data show the number of independent booksellers in the United States according to the American Booksellers Association.

Geographic reference: United States
Year: 1999 and 2010
Market size: 3,250 and 1,400 respectively
Source: Ken Auletta, “Publish or Perish: Can the iPad Topple the Kindle, and Save the Book Business?” The New Yorker, April 26, 2010, pages 24-31
Original source: American Booksellers Association