Statistics further suggest that urban areas, such as the District, have different experiences with gun-related death, injury, and crime, than do less densely populated rural areas. A dis- proportionate amount of violent and property crimes occur in urban areas, and urban criminals are more likely than other offenders to use a firearm during the commission of a violent crime. See Dept. of Justice, Bureau of Justice Statistics, D. Duhart, Urban, Suburban, and Rural Victimization, 1993-98, pp. 1, 9 (Oct.2000), online at http:// www. ojp. usdoj. gov/ bjs/ pub/ pdf/ usrv 98. pdf. Homicide appears to be a much greater issue in urban areas; from 1985 to 1993, for example, “half of all homicides occurred in 63 cities with 16% of the nation’s population. ” Wintemute, The Future of Firearm Violence Prevention, 282 JAMA 475 (1999). One study concluded that although the overall rate of gun death between 1989 and 1999 was roughly the same in urban than rural areas, the urban homicide rate was three times as high; even after adjusting for other variables, it was still twice as high. Branas, Nance, Elliott, Richmond, & Schwab, Urban-Rural Shifts in Intentional Firearm Death, 94 Am. J. Public Health 1750, 1752 (2004); see also ibid. (noting that rural areas appear to have a higher rate of firearm suicide). And a study of firearm injuries to children and adolescents in Pennsylvania between 1987 and 2000 showed an injury rate in urban counties 10 times higher than in nonur- ban counties. Nance & Branas, The Rural- Urban Continuum, 156 Archives of Pediatrics & Adolescent Medicine 781, 782 (2002).