In 2010, almost one-quarter of every dollar spent on R&D by U.S. businesses was spent in the state of California, according to data from the National Science Foundation. Together, the top seven states for business R&D spending (California, New Jersey, Texas, Massachusetts, Washington, Illinois and Michigan) were host to almost 53 percent of private research investment. While California leads in total business R&D, the state of Washington has the greatest concentration of private research spending in the state economy, with $3.92 spent on business R&D for every $100 in state gross domestic product (GDP).