How much annual revenue did Indian gaming generate by 2005?

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Map of the United States showing states that allow Indian casino gambling operations highlighted in blue, while states without such operations are shown in beige. Most western, midwestern, and northeastern states permit Indian gaming, while several southern and southeastern states do not. — Indian gaming U.S. states that allow Indian gaming.

By 2005, the annual revenue generated by Indian gaming in the United States had reached more than $22 billion. At that time, these operations accounted for approximately 25 percent of all legal gambling receipts in the country.1