A 2006 study by researchers at Tulane University and the University of California, Berkeley determined that as many as 10,000 to 14,000 undocumented immigrants, many from Mexico, resided in New Orleans. The New Orleans Police Department began a new policy to "no longer cooperate with federal immigration enforcement" beginning on February 28, 2016. Janet Murguía, president and chief executive officer of the National Council of La Raza, stated that up to 120,000 Hispanic workers lived in New Orleans. In June 2007, one study stated that the Hispanic population had risen from 15,000, pre-Katrina, to over 50,000. From 2010 to 2014 the city grew by 12%, adding an average of more than 10,000 new residents each year following the 2010 U.S. census.