From the Document: "According to the National Gang Center, the number of gangs in the United States has grown from a low in 2003 of around 20,000 to an estimated 30,000 in 2011. This represents a 12 percent increase from 2006 and (as of 2011) stood as the highest annual estimate since 1997. As of 2011, there were approximately 782,500 gang members. These gangs and their activities constitute a pervasive problem across the country, as demonstrated by a recent trend analysis of U.S. gang problems from 2002 to 2009 (Howell et al. 2011). Although the nation has experienced an overall decline in the rates of violent crime, this trend has not affected gang violence. Rather, rates of gang violence have continued relatively unchanged during this period for most of the cities with populations of 50,000 or more. In some of the largest cities, the percentage of homicides that are gang related is very high."
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