A report in May 2008 by the Congressional Research Service found "strong indication" that illegal border-crossers had simply found new routes. A 2017 Government Accountability Office (GAO) report, citing U.S. Customs and Border Protection (CBP) data, found that from fiscal year 2010 through fiscal year 2015, the U.S.-Mexico border fence had been breached 9,287 times, at an average cost of $784 per breach to repair. The same GAO report concluded that "CBP cannot measure the contribution of fencing to border security operations along the southwest border because it has not developed metrics for this assessment." GAO noted that because the government lacked such data, it was unable to assess the effectiveness of border fencing, and therefore could not "identify the cost effectiveness of border fencing compared to other assets the agency deploys, including Border Patrol agents and various surveillance technologies."